Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a1261e816b0b78…

MALICIOUS

PDF

69.8 KB Created: 2021-09-06 02:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f071a33e49fd86018555793bfa8a0516 SHA-1: d82aa0398b892019d2152449a0153ed172ba243a SHA-256: 87a1261e816b0b785d7eacc5d792b8a2ef1d9048816d8a0b7d77810040f01727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://ketchas.ru/uplcv?utm_term=poulan+1625+electric+chainsaw+manual PDF link annotation
    • http://innospectrum.eu/hirlevel/file/94674053883.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037c730f1f---dafuwiwaberozafegegado.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d44ded70bf---33565648392.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/fozanelo.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/kupabagifej.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c04ccf34---88672624432.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/1130117532.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0094dc07a94b68cafd0ee4591a801701/xaforelufuluwaromevap.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/470f0801d4124ae151b87ed2c5bded12/visebidusuwivuxur.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/24428646983.pdfIn PDF document text
    • http://fitviewer.biz/files/file/96175200996.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/8918683879.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4783f1f9c9eace5a2bb0bfe718e996e9/puzetolenuxe.pdfIn PDF document text
    • http://wahiclassof69.com/clients/874294/File/11878054453.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/vediru.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/zonivuwoz.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/okljbtjdqlasv9c2eota35fj6u/44494559266.pdfIn PDF document text
    • https://clubon.top/uploads/files/zomutare.pdfIn PDF document text
    • http://deauville.ru/files/file/febowebutewejo.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/47907153362.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/jeziwitabetapowi.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/75585851558.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/veliruxutudebe.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/zurituvularo.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2212581ee---11964287716.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/dupetaxawuzadurufinolafuz.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_off0000b29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29A 14704 bytes
SHA-256: cc9e3a822f88a7e35e47fafffbda360c909f9b14238dc016569ca2bfdbeeb023
font_01_sfnt_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 11156 bytes
SHA-256: 58f21499221c1c1580ad033d5949e9bb6dddbeb9e166e9afea33621bd4b14ee6
font_02_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1