Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a9510ce61e1133…

MALICIOUS

PDF

70.1 KB Created: 2021-10-04 08:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: adaf6ae4401596d790aa601caa343fa0 SHA-1: f3a33e25b1431f1dcacf75c74f434811600ebfb4 SHA-256: e8a9510ce61e113394d780bf53c08a96801bffe76393757fd3fd28d70af352b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a298b8f60e92a06cd66dfb8ca9013fe9/wiretodituxekawibe.pdf In PDF document text
    • https://efckrakow.pl/userfiles/file/veximokak.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/ruziruvikesa.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45097832785.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/66571511288.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/kesexarojutolexewusigibab.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/1269319614.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/43128586282.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fowitiviwobuvu.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/kowuzoxezedosom.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/reruzodabokajezorox.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/rerafasuvuremiradaxawon.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/82143349066.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/22937000921.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/35900329466.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1d5750c2ef312b379c1ecc208432bc30/bivirekagifigi.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/kedebix.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/worukug.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/93352499028.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ba8f28c5a9693e364943ea38feab7076/47552030222.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450021e38a4---sasexibijevopekipe.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a5d0f59db758e8256d5f92012d32d80c/82446892313.pdfIn PDF document text
    • http://pedraferro.com/files/files/gijugodubakazusotudomebox.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/84734770748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=a+party+wall+agreementPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 10396 bytes
SHA-256: 7456857857767f2a5a46e8fcf11ef1aa151a25c9785fefc594014b7f8088cd01
font_01_sfnt_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 16284 bytes
SHA-256: 8d071634653097e82b798ea76a137248750327ccb9190e41ac9248ee89cc5926
font_02_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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