Malicious PDF — malware analysis report

Static analysis result for SHA-256 12aad3f8905594e1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 05:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82478e0674f5fd12e62f2493b3501e11 SHA-1: 4e746c6e9e2faebb1eece6e0dd91a9ee6efd5e28 SHA-256: 12aad3f8905594e158759df1936431eb0da02234297381e6e5018efac2897ad3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a callback phishing lure, prompting users to call a phone number related to billing or security issues. The document also contains numerous embedded URLs pointing to various domains, some of which appear to be compromised WordPress upload directories, suggesting a mechanism for hosting or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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) documents that carry no urgency or charge/dispute escalation.
  • 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://crewmak.ru/uplcv?utm_term=port+contacts+to+new+phone PDF link annotation
    • http://tce.vn/imagesflashupload/file/17874910340.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/nefolodexuxezobidew.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/33657027341.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/jenakanujopozafabulem.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/19096096146.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/sevonibufosenojarojununip.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/20037775372.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/majoged.pdfIn PDF document text
    • http://innotack.com/userfiles/file/52530819295.pdfIn PDF document text
    • http://skia22.ru/pic/file/xopinawomipamojefokovono.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/67361295189.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/kabidizewokuziworamuzuwu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138670cc3893---navetagun.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///parupukoxenovi.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/weniwaxovufiwu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7ae39d81a4787732e115edf8287a5b79/jalew.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/retuwudajekuvikebux.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/temewuzawanego.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/65987444323.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/nifobifejexonakelarewas.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kewafitezeva.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/fesim.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/29ee1b5dc9380f550c4a498b931af9f9/vuxerukonisu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614146fdb8659---39111297186.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_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 17616 bytes
SHA-256: 065df1c0b0b7cb8fc7e17bfdf77930098e2e78bdea0893dab686d213d2768739
font_01_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 10420 bytes
SHA-256: 023ddb80c334b6a318a75a126b02462773ed1aa9dfce51662465d34de2517f43

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