Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3ef73f47ae27ad…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 19:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 289890e83fd6a09bc87434b5b7ed78fb SHA-1: c2fc83bf23a735631ee809dde3c5608b3e3c7c9e SHA-256: 9b3ef73f47ae27ad2fe2bde1a552e2ed0cb2e231f377064216083a7b22a6a6df
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of numerous external URLs, some hosted on compromised CMS platforms and disposable domains, suggests a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in phishing and tech support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=amana+dryer+ned4655ew0+manual PDF link annotation
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/kexepe.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/fijudesamaz.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cb69dd1d16758b7b4819aac7dc1ba685/33190226050.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67bcf1f478---boxanovigelojijojukum.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tnl7i6ogjcuqj4ecu0f2ehf185/lipidilolajidavurajaru.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/xopetavogosimugusuru.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/95428164198.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/xeworuduvesidejupes.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/lases.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/goxizopexafe.pdfIn PDF document text
    • http://renovator.cz/files/file/tobepademulivajadexe.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/561355970912676923ed9aa578ba3785/83043590165.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/xenasesavubaj.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/vajosa.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/bupawiwegedodoteboz.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/93457004192.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/welaridi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d8735e62d94---xusadalibu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e958d91be4b---25836827027.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/25408408824.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073adc1483c7---76078824452.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_off0000c432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC432 18064 bytes
SHA-256: 69989ca44fef2504baf5cddc4fc06a37cdec5ec99211116d25c98377236a29e5
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 10712 bytes
SHA-256: fbc442db48f28727918de69d5c36fc54843577093267e5c7c4e4182b233b4eb2
font_02_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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