Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdf8bd1397fb819…

MALICIOUS

PDF

103.7 KB Created: 2021-07-22 05:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 49210cde0e80334fc52ad778eca105db SHA-1: 7caacd84c84b080d07080f26221b096d6dbee0e7 SHA-256: 7bdf8bd1397fb819072788292c782b5bf106326e7b1402db1c5ee034e0b18de5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to exploit PDF vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/69c5d1e5361b21859d4bef5a2675207e/ruwoguga.pdf In PDF document text
    • http://leguido.net/files/gosedove.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/limujakokopilux.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/26450038199.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/7ee69e13ed7fbf33b3f9da0fa309e745/12438488307.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d9710e9d---zisedivarowa.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a651b4ee5a2---pelewilakiluxilevulepalex.pdfIn PDF document text
    • https://alutat.com/data/file/japatexegunololinawo.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef33e616cd---zasokil.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/wisafigejovizojisajasis.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/45594410475.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/serowumuvetefurajedezaz.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/73516363943.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/gewukagumeruf.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb1e9de952---rovimozekoroseloku.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7f167de3---dozex.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160841f71b4b05---giragizigametojajas.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852f8479aa5---digepevabuza.pdfIn PDF document text
    • https://motacademy.it/file/kixikomajo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d7f3c6e8---lejotegugevom.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a86a9b33ec38a4e5f16c80ccbb1efa84/49656896550.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ifujud3q2gjjj450crriueovj1/wurogufono.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/95956212289.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/84b376eba004cb5ce32121bc603d1734/68436176802.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986bfb44b4a---pekabobozumuwera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hazcom+what+you+need+to+know+quiz+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 17904 bytes
SHA-256: 5eb8dd964d915f18c0e860615efab98f50f04f5e5d1c678073d4b4b128e40a90
font_01_sfnt_off00013cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF5 2520 bytes
SHA-256: 9a15e5f29cadb938a1f2c9df8789fc2968759e4452f155e2809d77d2302f5221
font_02_sfnt_off00014806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14806 11176 bytes
SHA-256: e4ccdc72b005a897c31da7134f1b036aa52f58449cfac275ee7642d1f61e7b5b
font_03_sfnt_off000161e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000179f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179F3 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855

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