Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96682208a375e5c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-06 19:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d297afd6afc32650c962c20124e2e53f SHA-1: bd9c0284dfdb1ab2c2a8f1761b8f05219f8110a1 SHA-256: c96682208a375e5c7f500d3f6bd8ece2f9a52dbd40cc5b1d997257ee4e7f56ff
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites, likely to host further malicious content or phishing pages. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's intent is to trick the user into initiating a phone call, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=osmosis+diffusion+and+active+transport+pdf PDF link annotation
    • https://phnews.ro/files/file/zigizogizopimexojuwa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec314261a6---16428349.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/mubiloxupivojubiwupeje.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/biveduzakore.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0479166001619988721.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a8e01ae919fd20b09a8d959c32ad0069/pofepa.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/somalisosinokenil.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/lalomakipo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bce5750eacd---dutusumowexosozariwevuz.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fanemoratikik.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/nevexosufo.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/wikazepodag.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/siripumopobodomiselejoka.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/htu3hq5fm0and924q6kbcml2oh/82168530341.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/visexubazejivafeluguku.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4dba03687---vefuxeduxevali.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/93736355128.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/60512181454.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/5cc9db6fd6c31f1bfe9c2be5d8393edf/jebut.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/81766950893.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/22665169835.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a88d7q3l2okbb8deia5ejvqejo/85873767862.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_off0000b35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35D 10928 bytes
SHA-256: ebd358bea354222dbeeede4e4a0ce7ba3053c79021d5a7aca735b64f3bbffdfa
font_01_sfnt_off0000ccb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 14692 bytes
SHA-256: 96d2a7f67e451eb6a7c24039d70d9c55571fa7b1cb9a7ebea9b17762eace44c8

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