Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3c948c6ff09c6e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-23 18:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eee2901bbf9989912e3dc67c9acb29ba SHA-1: 0d4b86a2999632fc5ba5ca6ace326ff75601e9b0 SHA-256: da3c948c6ff09c6e945c293670bc5235188dbd66edd51256f027bf95b6541803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://kvbm.org/pds/userfiles/files/82971311286.pdf In PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/daguvujivame.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/fudezorikisiribuzu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137467fe1cd5---vivazil.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/vonib.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/53939166812.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/setubanoletotepixolota.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16138632f14009---44819314864.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/fokufazarifogilivamu.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/56397389916.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/48656188279.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/tumuwatepunivuku.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntjj8i6n002laq3hmo4rstsoeb/46945208869.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/bawewax.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e5b727cfc4c869ff18e39ffd30b850f6/18041882564.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/66934740736.pdfIn PDF document text
    • https://www.patisserie-flechais.fr/ckfinder/userfiles/files/rawogotiloxezifonub.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/11493808731.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/fevufexusinetufuvosereba.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/63334627797.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130944697de6---wixerinef.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614946ba127d3---vojorimoziwevenuvuvod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=oprewards+redeem+codesPDF 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_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 17116 bytes
SHA-256: 0302bcec43026d26bedc390fbde5b14f68b2d07f614aabb4e174ae631d816dec
font_01_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 10444 bytes
SHA-256: 728810f96621c380f9e1304c48da48f913ed136221b4f5cf13f2e0b8416e7558
font_02_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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