Malicious PDF — malware analysis report

Static analysis result for SHA-256 facbc935ec438a19…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 14:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ecfe7faa7a550f60722996552de1b91 SHA-1: 3f58725f5ccf8a589bc03fbc81059bc5587318aa SHA-256: facbc935ec438a1960a5554ce6b24b1969b23d2418e68838a05d43ccd25177d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term' in one of the URLs indicates a potential phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=sony+a5100+manual+pdf PDF link annotation
    • http://mp-journal.com/media/file/sovejegumijetaxezo.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/21385390521.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0gmjfhpgjt8l7qidb7ttdpmisl/24984052932.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c24dd9a32c0---24538046739.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608543cf0f4e8---larowanawategiwodoruwowix.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/maturarusepukaburefi.pdfIn PDF document text
    • http://makaroma.fr/upload/file/42533811230.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/jiridedipupuniba.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/65947420181.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/93938760638.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8591a6ff---8585410997.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/dea36ac76b983b393991848bdc3c9e45/15619986691.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210814215434794852ypusx.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0dc0dc82c---32300297141.pdfIn PDF document text
    • http://coffee33.ru/archive/file/lisiluvu.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/8tqpk965uhumeodld4euv27652/kavimisifapakelomak.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/fe38550257a1f9aa27776ee08f941a40/19236794304.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a091e775834---10127724834.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/bml1rrj0e070fm52nglfnp5t8k/vawokexu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/da86aac21fc02f3e9996a62c044b8ea2/popamexubekafori.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a8d9556b394ef9c87b0bb090c082678d/98796364427.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68322cbacc---34279608653.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c248e0cdc4e---miwubofum.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 10668 bytes
SHA-256: 430386b5f9b7444e3ea8f62893afb71efd5630c1a9b522c32977dd6e3c586b1a
font_01_sfnt_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 16264 bytes
SHA-256: 253699acb110697fa528ebbbf8d3a33bb6a07284c2f9216f90142f5380705607
font_02_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 22872 bytes
SHA-256: 2fe5247fc6d02df47a4201448f282e8b9b8e4cc793b8d014ab4d3bb10fe7e8fe
font_03_sfnt_off000133be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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