Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf9af8bcfee4a27…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 13:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 216e3c2dd6cb8a2936e9181feed7dccb SHA-1: d6cc498fee607c20b6514ef80109bc83b5280d74 SHA-256: 1bf9af8bcfee4a27307870cc212980a108e96d1c8b913ab097f6cf74447aac15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=internet+gratis+http+injector+2021 PDF link annotation
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/muguwigepevodelax.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/xokewiwisip.pdfIn PDF document text
    • http://fruitvita.com/files/files/vizirekitelumekidamibaxat.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/57773471053.pdfIn PDF document text
    • http://cascad-trans.ru/files/29688978597.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/jokojatadugibitizim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1fbbdde55---35231703548.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/84463393974.pdfIn PDF document text
    • https://rubfila.in/files/file/nixipudej.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/83986134985.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7327cc61d5164e4a3e8b447626a5b723/32202814343.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d762b9aeaa00ad6a55054600061ac25f/jukoduliniz.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/43305530826.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/53410701757.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5afaf8bf---73036701974.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01c2ebde8---74469492703.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f3eee5f4f8ccfb2101e43514bc1de190/65155443384.pdfIn PDF document text
    • https://onecre.com/images/content/files/74915817598.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/57137912399.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/36137805348.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1bf9e2fe---40910700382.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/6791165034.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378725b2fbc---fusivuxu.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_off0000be6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6B 10980 bytes
SHA-256: d7f58d9a4a21c023eea9dd845662a38075cf1a3612cc55f2aa40909bf98c03f7
font_01_sfnt_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 17992 bytes
SHA-256: 5a399cc316a50c7c22710b57da9b6b381967aa02bec16a8bef1510f310e96940
font_02_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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