Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a8d57cdf48a031…

MALICIOUS

PDF

95.1 KB Created: 2021-09-10 18:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6dd931a906e388730da68393e3ef7bc8 SHA-1: 9c048174dac33c7493abf45f8c2b0815398017e8 SHA-256: 01a8d57cdf48a031084fe320b54e8ef8b6ebdc8fe18a556e8d347360a98d2b3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b12dc0a69---9832139492.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b672848728---63331541405.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lutunenaduvadagosixare.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/laxenu.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/16342092560.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/legogosukewewixoruv.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/85266270590.pdfIn PDF document text
    • http://szpk.hu/_user/file/jinadujufesuka.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/18987139939.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/71h1bqfgg0ghou4np9c7huben4/37612563393.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/19513048359.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/13677799742.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/ledajak.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/86542373722.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090423222037.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/kawuzifet.pdfIn PDF document text
    • https://scalping.ir/data/files/file/50854620606.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/runez.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/tekavuvezububowitikemabek.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/q43b597bj7gf96e0aisnaf4mtb/84356941655.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/84335644063.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dffbecb5b---90385724491.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/57460927005.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/rojosevufonogoziwugotajik.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/meponopasifaxafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+9+language+settingsPDF 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_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 10684 bytes
SHA-256: 75115af4754c20a5a5fd5130f5c4a94c3172f25c98a591dad896c32f569af7bd
font_01_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 19668 bytes
SHA-256: ba421e5a7fe8985f0f2671db3d5ffeafb45a237fdf912541213031bc85949658
font_02_sfnt_off00015661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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