Malicious PDF — malware analysis report

Static analysis result for SHA-256 244ee65d3ed93f86…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 00:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a90c3244953bd3d21698467891d7401f SHA-1: 04ef11d8d81aa1e739bec088e5d6ae5a316b41e2 SHA-256: 244ee65d3ed93f862b82f31fc484fb4701924e2ecc4eb725e3247e7eebdbfa4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to further stages of the attack, such as downloading additional payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://laborke.ru/uplcv?utm_term=google+pdf+viewer+app+uptodown PDF link annotation
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/107694ae0b15ec38706874aa8160aef1/13143454123.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/eodof3r2rsn66n0024jpc500u2/zebadum.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/88785239786.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/18103567406.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/paresoxopavub.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/ramunekuxizosavumoj.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0b06647432de657ad437e46798bf0dba/gijeferojoj.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/siwuregofok.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/11837437069.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/wibetodaximokibezas.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/guwifekatelomebivir.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/tv6o3fml5frul062uc215h5gi1/46771793394.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/leganelo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5c4cfe3659515075ea13e4ac736ba3f3/91746237711.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gvla4k6v9jd07g6jc5787co3s2/13024705021.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/66733833527.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/78928430586.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/68463172624.pdfIn PDF document text
    • http://besteva.com/upload/files/larisilogop.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613447ae01419---zagolobifutosujalet.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/zexegofenebena.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf566e240b---dutaman.pdfIn PDF document text
    • https://aokman-drive.com/d/files/rasimo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/49906480316.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b346efae---46979548405.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160fe20fdab305---fulazuxidelovewodozi.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 10796 bytes
SHA-256: 6e67b0fc22b4ca43cf34f1ad088c75cccfe8b4eb6c88bf2f5f1532cb90e625cb
font_02_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 19932 bytes
SHA-256: 59346299df4160b5a33b8793f4e86c55163490b3b04e1061577c7909b43f3da4

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