Malicious PDF — malware analysis report

Static analysis result for SHA-256 120c21b98c3a0167…

MALICIOUS

PDF

129.5 KB Created: 2021-08-09 03:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 58302f654f3dcf1869b1151caa43a274 SHA-1: 3584baaf9f8b559ff7377a471b1d6994e5079e7e SHA-256: 120c21b98c3a0167ffe133157a45d69f7ba80960ad81857c9dd5d81d61238971
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true origin and host the malicious payload on seemingly legitimate but compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fc720d7cb---gubasulivejozupu.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/92edfa2193f8ed3ad0dfac193b1e4525/xozopagebakozewusujoziti.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/zawanoxebolo.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/97685321697.pdfIn PDF document text
    • http://bjjiffy.com/upload/tafipititurituxesolid.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/dafitiwuredatopajezekaf.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/84171446620.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff1f5cd3bb---25850724833.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802f3f68460---92447629541.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/kipala.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094db1392d61---22717789836.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d522ba27a---26029628353.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/52b901cdcae86ac70db27ab66e2141d1/vilomure.pdfIn PDF document text
    • https://digireg.com/upload/zovazopeposixo.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/78470648688.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7f338668---xuzujonevose.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040552216850.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/78f47564fddd3380faeca1b460a6155f/80649225062.pdfIn PDF document text
    • http://didopack.com/files/68421165538.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/pawabav.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9mmr5ea1iimjbg4t00utsf4vo0/geloludabuwosovuduk.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/68767120172.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/xurivike.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/4487207665.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/potopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=market+leader+upper+intermediate+3rd+edition+answer+key+revisionPDF link annotation
    • 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_off000194b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194B8 18316 bytes
SHA-256: e1fd9fc9ab629714b05bab484ad5a9756a08808fb9b0909fddc5456971bad2ba
font_01_sfnt_off0001c450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C450 11176 bytes
SHA-256: ea008bca7290ebe0a43a8b99984ed9bd5811bc784bc815365084370c8c0444e2
font_02_sfnt_off0001de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1