Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcf3e7e5588e01d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 20:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5e5b4c0a56f51b094613cc8d3bf8d9d SHA-1: c7255839ef18318645d19a3020e928e4b3d36d2c SHA-256: cdcf3e7e5588e01d3af8aaa867b0c46ba2bd7bf933b733736f89d3b9df276607
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised websites hosting PDF files. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading further malicious content, likely through a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5f6add0e3cbc42b5c59277e47f96998e/kesuxofaketidebati.pdf In PDF document text
    • https://theelementrama9.com/userfiles/files/dogonujiguredefajunufofo.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d411c163d90---zerunuropelov.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb74d5ada7---68887777313.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/771a5e7be76a5f9524f31e0cc0a67adb/gevogixumu.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/nulowetupunopizefizavik.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/61606425778.pdfIn PDF document text
    • https://majubesar.org/contents//files/59439208470.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/55726716118.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/33101815299.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/4043644894.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/82111923916.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b686c49d3a8---jeborovesubejivefugeduda.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/podukiwebibewufad.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060606465480554.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/78459994949.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c2d12b6598907460f2aa96884ccccd24/42177910774.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e4c2f010b9e95e6eba5cc1b05f48c93a/zipelanasilepilop.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/m0uis89a9n89j2u5hla3ne2m3q/vobubetiga.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/ravemisanejut.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/45416031670.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/9325696473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=examen+toefl+ibt+pdfPDF 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_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 10616 bytes
SHA-256: e2a7d1bcdde77dc6f6645026594d574266a7fa903eb026847d6295daf3d51917
font_01_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 19872 bytes
SHA-256: 777eb7d81e95a95f6ab5556e06b2bfd87b8bc548ff2f46e6348803b718eda688
font_02_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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