Malicious PDF — malware analysis report

Static analysis result for SHA-256 268aac18f6f5f2ef…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 04:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6e035430634e6b5d351ea5423df64a7 SHA-1: 30f6f03e06575068c1614ec8c0f52cc30b458db1 SHA-256: 268aac18f6f5f2ef8a7ce2fcf35dbed31221ba35a48a414a8d51b0efc7ef36ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://hrzservices.com/uploadfiles/file/tijudozetexedaxise.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9de2a089d---7401584265.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/tepexosowanelabimigamozoj.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/97380672896.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/pirimukakarowufero.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mkshmk09esp89askl1ku5migal/vegubilitekoboxatobobemoz.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/dimokowujanasufil.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/85413279361.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/zizaxebijaxu.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/73238357944.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/61662431878.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae493ec2dcc---37135871791.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/sikepisikajamo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121713040d65---69159317225.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/39819225427.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160af9810e5cf0---55830961041.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c40e9b470b8f76eb3a9968c60630d56c/vurazobazuzasuzifi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7709b49da---poxuxinupoxelemovode.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/buginodusa.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/40910aaa539765a8f30310a1b2b8a145/rotinejifori.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/adaa845295271d5f60eb460ce9861480/87247875923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=upgrade+windows+7+to+windows+10+clean+installPDF 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_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 17904 bytes
SHA-256: 5558c7afd6022271af352df34ccef9ff9d0d3273ab9a2ee592320b6019582dcc
font_02_sfnt_off000123a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 11008 bytes
SHA-256: 8c53f45bae9f8899386ddd40e11561c199a1f31960e9ffcdfd05617cca091103

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