Malicious PDF — malware analysis report

Static analysis result for SHA-256 952f9959eb8be3be…

MALICIOUS

PDF

76.7 KB Created: 2021-10-01 18:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 6b2a2d9f1923bcd91e8380ceae724004 SHA-1: c3c95bb14758b81fd499f2789949297144d5ee37 SHA-256: 952f9959eb8be3be5cfc2a9be8675e2e266d4fcf2ff4fa205870f8bb70e84856
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and potentially disposable hosting, likely to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558a7aa7739---xisuxuw.pdf In PDF document text
    • https://doosradashak.in/ci/userfiles/files/17948648639.pdfIn PDF document text
    • http://partnercable.com/files/vedubetasorijewidomope.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614a284a73576---97763163134.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/vufinagataki.pdfIn PDF document text
    • https://castel.ro/userfiles/file/25048452896.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/nabuzitakiku.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/vufizezujomig.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/21166048517.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/33840905835.pdfIn PDF document text
    • https://adikkedua.com/contents/files/rufakubudix.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/71226657993.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/potafidikifalozemomonakeg.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134155366e7b---4854376362.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/82772685591.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/8943425620.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/fimuxidosoxofar.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/44662093615.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346993a4245---nipoduwefasalizeb.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/kinotexijewamisal.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/leredexaruvudipewegapuvur.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/25400738714.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433ebcaa4b4---68838701058.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/ravite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=breaking+the+bank+henry+stickmin+apkPDF 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_off0000c3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A5 11056 bytes
SHA-256: 221cd3dcde15fd65ef1a68281e23b58c6e7385f80461f766a1e3701bdca30a97
font_01_sfnt_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 18612 bytes
SHA-256: 9b8abddd09c7cc09ae0941efdd51f3055f565fdc5872a687a9828299953fe076
font_02_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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