Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32734cef7865af2…

MALICIOUS

PDF

93.3 KB Created: 2021-07-13 11:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6651b2dc9e5888d7554bf29a67283b1f SHA-1: a2c22971e959984011a9e7b72e17d0f4535a26d6 SHA-256: c32734cef7865af2929f3f80caa56851949cc440efaf4618c50ee7d7de1f398b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It employs a link farm strategy, hosting numerous PDF files on compromised websites, including WordPress installations. The document's content, though heavily obfuscated, likely serves as a lure, potentially related to job applications or similar themes, to trick users into downloading further malicious content. The presence of multiple external URIs and the use of compromised CMS upload links indicate a distribution mechanism designed to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://skomi.ru/img/files/file/pudurimaxipusefabi.pdf In PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sunokudoratizuja.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fetezurulipoguxemefefak.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/deliruborodewebuveregak.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2ce97059c7e054baa164782503293005/makemuwimoxopeperexoloza.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/pv4kjfnnsb6u7cfu3lpue5qddr/26376527409.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/vepozovubabewuziremaz.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc5bb7f586---jekakusedogorap.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/77613c783df58d985ab10c142efdf671/85689881967.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rkecsfteq65j1531v5n1gfji9c/vetifugozosemaf.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4fd721a6f6dcba5d53d55b0571c63103/pewufamopip.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d40974d6---23612671595.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/377bcedb810a5d916b558653562e4780/64616448462.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numolanopetutesamafu.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/sewol.pdfIn PDF document text
    • https://aghs.in/ckfinder/userfiles/files/murivukip.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/sadiw.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073783457117---ximobiwukomuxazojesadi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/fozemufok.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d71a59611---37746326989.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/76771766436.pdfIn PDF document text
    • https://wecareprogram.org/images/file/xajakaxajunubo.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/64510024173.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/lefosozoxufi.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/19333624828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=resume+for+accountant+fresher+docPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 17216 bytes
SHA-256: fc09fa2d33dff38544590bb26a868d6bfdfd028e0464801b330633fa83f68fa4
font_01_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 10748 bytes
SHA-256: 64df2b77881ec1707a7c9a16a5a4d0624f02bcb0c2aa00b39d2574e844dbee6a
font_03_sfnt_off0001501e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501E 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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