Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6dabac3cd8c51c…

MALICIOUS

PDF

85.6 KB Created: 2021-08-15 06:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1e7d7f7be975e85c7fbc4e65415290f SHA-1: 63739849a5c5f304509d474b5673dbb52f5e9b0c SHA-256: 6a6dabac3cd8c51c3c292bbad25f38ff8abb59519321d326127345b33104dab3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, which are likely used to host and distribute further malicious content. The presence of numerous external URIs and link farms suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=how+to+compare+ratios+of+two+companies PDF link annotation
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d86b287f8c---gijanizelifisagiwunimedi.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/60081700853.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zesawanagadorovuruni.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ioehr1vm4e792jsudmj95thoi0/jerolawe.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/22804261073.pdfIn PDF document text
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/85559736020.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/dotigonejepaxokawafu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3b73e4dd67cdac70808cf9c68b95e8a9/93331835557.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/51421058117.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/jagomidejatiloxuvu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c3feac5b2---60344036325.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127c17197b---44096334982.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/37037125745.pdfIn PDF document text
    • http://anupbolivia.com/images/files/nilezivob.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/5106f96a0a4dc62b88dfcb49543483bd/gujuvakabewalumuzalewe.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/2709653801.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56c903bc59---dizagudiz.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/21001264023.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/sotadikedalasibi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1216ddf00f---duxamibipuwibirab.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/nenuwulufilodogojen.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/90236535823.pdfIn PDF document text
    • https://medtek.vn/storage/file/rawodisix.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_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 17676 bytes
SHA-256: 6735d2834d968fcbc8a5da729d5696510a55d09aef2a1548a476b9ca3f36dcfd
font_02_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 10672 bytes
SHA-256: 0f012cf247ba23a7f427704cdacef56834c96dabed44a2d4e2bcc2e7deecee49

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