Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ef13a994afe1ec…

MALICIOUS

PDF

80.4 KB Created: 2021-06-25 22:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26091049642b47c320b13751b4182faa SHA-1: 97015b6d82ee48f230865acf8231723f671fbefe SHA-256: b2ef13a994afe1ec0465d0ab2a8957e8bb6d7807df6a8629a966271b9c7b622b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress installations and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2548

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2be3796b---73686488705.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/nqlgfkhgij0a40ojihll2s7ne7/65274319362.pdfIn PDF document text
    • http://djpress.pl/Image/files/19866110253.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/70160525843.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/patakesodosuvobib.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/16344673365.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf625596d5---77617991635.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fbc74a919---jizupilegusosuviluben.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/wufovebewi.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/22617398050.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/31754511791.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/26310270130.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/segoro.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9172930c8e---dowufajapurexig.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/wuzokowisutabi.pdfIn PDF document text
    • http://elitvorota.ru/f/file/sugadegujuzado.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/e2ln93knkpg68ihfk1auq9mevf/boriwese.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5302323619c357c66f83f50c636419fc/80160552845.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pqog41elcg2qag6kfk2mbl98pm/91615498543.pdfIn PDF document text
    • http://4bx.pl/public/file/32681396618.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/12993335732.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5d1tqlcvlvcchedrpl9lelt4g0/didoxaxorupujubovologiz.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/36631510038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=facts+about+ganga+riverPDF link annotation
    • 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_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 17316 bytes
SHA-256: 72dbb8a1c092e5f281800ba19a302c63cda05125ba688b851716a462d2eeab65
font_01_sfnt_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 10644 bytes
SHA-256: 5bc78084163dc22c8a616c75107e486db021e2914d760b30a3be2a68350c92ae
font_02_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1