Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bb13ddc322877c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 03:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b6dc5c06eceae93b16c4f1d3b18a212 SHA-1: adca63f256a886dac63508c98315392251f4948e SHA-256: f5bb13ddc322877c718788a665d2e8e9d7bbc66ec21080a4bf27f76d7733d1d6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The 'SE_CALLBACK_LURE' heuristic indicates the document may also prompt users to call a phone number, a common tactic in tech-support scams or refund fraud lures. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=comptia+pentest%2B+study+guide+pdf+free PDF link annotation
    • https://purefeeling8.com/data/file/safivososibopi.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/53849086352.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/gudeviwowasajid.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/98114421947.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/guxixufolanag.pdfIn PDF document text
    • https://bamor.org/userfiles/file/forifonozorin.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d5016e0e0---fenomekosajipod.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/xunafej.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdfeb5935a---gavixuguxas.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/20399435654.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/48079896370.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ce36624141d---72586553527.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5g5uqar1k47326p58uvifjioml/90205930349.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612900aa37c66---wenipinisowanenuk.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fobajuvafidafagizinepile.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/bomuj.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/33879968204.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/oelsv6smao5lcub83rfajtt4jv/82487785001.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/zavoxufa.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/lovusanak.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/zuxomuba.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/nuruxufifoxogunuterule.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_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 17560 bytes
SHA-256: 18e4d97fba43c0cf87e29c430d25c74265dd7f16530661464f3c8c9e7fad1cf8
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 11040 bytes
SHA-256: c9a95e40e129c025548aaa4f8504831275ca52a11269b5a6be6e354fa53e0cfb
font_02_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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