Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2ac39bf47fe37c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 09:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4db6e26a5bdf88dbad171829dc54e387 SHA-1: e401a19ea1905ad01f0d24f817032f4188935554 SHA-256: bc2ac39bf47fe37c7a0a0366b8ae59d387ce4dc5851019c24cbff14f15f54e78
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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.
  • 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://queure.ru/uplcv?utm_term=trauma+raquimedular+tratamiento+pdf+2018 PDF link annotation
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/22960229128.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/zopos.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/voxotevibokaxiwi.pdfIn PDF document text
    • http://haai.org/upload/file/xuzuz.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/5432943070.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136463129330---lamoduwefisirazuv.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/25917364111.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770fb47cdce---48051683624.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8015be6d7c---malixovabolutuvizu.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/35553279505.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/64c0b47b018c873128adae1660c1c236/rojapatidesevuboluju.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/werotarapubizejav.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba91be7018---59370548619.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3aeb99e81d2490a260dcca3d1a608fd8/vesofunepoxofadulitofefu.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/57213895461.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/24769889477.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/romepam.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gat2cihivaaabfb7c26kfaqjsl/7723206637.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1aprsottqedk68qde1rdu2525k/dulexed.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/g70rtotrbpims98p2mpf69vu4u/51293636725.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fe6fa8916---48299146634.pdfIn PDF document text
    • http://info56.ru/userfiles/file/83193181982.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/92348229973.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/viwekukilagoxivulig.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_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 11200 bytes
SHA-256: 9303f9cce58411633dffc26978083449a77a43144d9b172bed0a7420b419af96
font_02_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 17848 bytes
SHA-256: 5dfe5c4abc7a17309a06ccefc0e7711712e1b345dceb8a202377dee3ff5aa802

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