Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94c6b5c21deba24…

MALICIOUS

PDF

101.5 KB Created: 2021-06-26 03:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a29d67db4e165bf5b207da389f38a3d SHA-1: 73f7687e5266382873099d529cb6bec14a88b458 SHA-256: d94c6b5c21deba248123bf9d86558e51db7241d1f3cbac169dc12f9fb5e5db1a
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple distinct hosts hosting PDF files suggests an effort to evade detection and distribute payloads broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://ssaisarang.com/ckfinder/userfiles/files/lelixaxafakadater.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607117bfd5f38---fawodobinalodesepokaf.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b18bb3d5c---75428736089.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/m0idrhf1bg8hod9ecbgtajmmuq/13915654043.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27dcce4bc2---62712289676.pdfIn PDF document text
    • https://areicon.com/images/file/tutozulijujutanemedevigaz.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c2ee2a78a5beb6b7a76403817a93825b/23866276195.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/4638112380.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3f6eb48b2---32997235578.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/lajajefuviwonebinomexeveb.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/61036241627.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/11545420121.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50663e360---lekajexabubenidateravaxi.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/89361193888.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/18b7aec3336faa8f7943452464a2f60c/xozabuzapag.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/16387e87e06a0ee157227c874f472146/wekid.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7feeb217f---zutizudagiji.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a9b2b3a56df2c79f3517a3f95cd55f44/40822694123.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/cgchd90t9frcd16vob4pdeciv5/dotuvejejefiges.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/lalakesix.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ac28c9e97---90066566025.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/80ebc5ad8eab3314526cd9277dfa1cff/4814827813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=brothers+hail+and+dent+repairPDF link annotation
    • https://mediaget.com/userfiles/files/fenukolowuruvumekek.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 10540 bytes
SHA-256: 0def3a59d66a0abff749b9b782366e4a926487d88fa8ab9e49353a3d643c16f1
font_02_sfnt_off000142c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C4 16672 bytes
SHA-256: 23e354c79fc39218b32aabf0e7f151d5e53eded04014a2a731556f9812aba948
font_03_sfnt_off0001598f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598F 17700 bytes
SHA-256: 3523dab2a591c3002c1c95021ac84f9f4b0b77fddbc1a2196b2a77573c0f6ed8

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