Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c45ecbedb312ed…

MALICIOUS

PDF

94.1 KB Created: 2021-09-06 03:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ef6c30658d91efc153e341974ee2d6d SHA-1: f88637a246cd9a11a7d1561c7ff0e7e04105721a SHA-256: 44c45ecbedb312edf65407e848725ea9936b1ce65a045164d7bdc04e26732a69
176 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is part of a phishing campaign, specifically a callback lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous links to potentially compromised CMS upload directories and the callback lure pattern point towards a phishing attack designed to trick users into interacting with malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608317240f570---mezepu.pdf In PDF document text
    • http://hifitness.hu/userfiles/file/vibololekade.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/80109612999.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/kujimikudizuke.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/bedoronixilokebudip.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/lavugazol.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/vudosixakexipominameve.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/23635293715.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929ae3d60b4---felitafux.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75cea5432f---42190591075.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6fab7749a405ea883a39c3d855ff372e/kitefabovijebenivowenasor.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/bupenefinolanepixit.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f9e9a35f---71287403424.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e2e80087ed364783805f9372c8a6e15d/torifim.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/98368925891.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fcecd4d60317426cf6c50a04f46d983b/kuwosanejarenavafurases.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/pajipudif.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/30084838740.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/didigen.pdfIn PDF document text
    • https://afayl.com/userfiles/file/67535863510.pdfIn PDF document text
    • http://consade.com/userfiles/file/79541259987.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607972d266990---87311804059.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/betaribapajolojupewen.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/jepevamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=therac+25+case+study+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_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 10784 bytes
SHA-256: 1c6f2b34366bb9712bdcba387149d62cc7edeab2aadbd4b5e3754e29f6fd91fd
font_02_sfnt_off00013afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFB 18424 bytes
SHA-256: 947e291d8693c78403f0821b81c4e2c543c8f5b6f395ac32c1ca44720159080e

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