Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4d9abf826aab3b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 22:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df272ef0af89e4076c2d9850bbc501dd SHA-1: ee9795a69ff882fa981ff8d5e60438175710e3dd SHA-256: 6b4d9abf826aab3b4a0534f89770b0fbbe5da6963789b11a8fa2f1219873afc0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a billing or refund context. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to direct users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141316f903a1---16954058322.pdf In PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/92083346905.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613094134f3b3---rorivinopo.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/43138130001.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/gcc8tohvgni79j6s70tl1aagh3/81127797244.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/55199133782.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/resuvugoguz.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613240bab8863---82500245318.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/09aebb33d20704520b72b71d452f47af/tobamij.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/kesukoguzizefuwike.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/31179549466.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6a610bf97---jafavoramefexapomugezured.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d6a892b6---76527471611.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/nozuvimun.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/23420600568.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/busuxogezip.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132568123093---lezitajami.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/gevenakufopiribu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c2ed2e79a1b3bf20481a213c9cebf562/wanilajaluxi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zafapogusijupuweruguros.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/50380162520.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/8167183069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=joox+music+modPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/dewesamusilebirutexuluk.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_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 17696 bytes
SHA-256: 3fc27b5ed928cd7b5ea1c2ea7a0c011e9d6635eac8fea170f1cdad1d59a155d0
font_01_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 10080 bytes
SHA-256: 95fcaaebb1045e3cd9597efcb9a0dd2f8e264cc65f5ff207d3e2789d0b61b5f9
font_02_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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