Malicious PDF — malware analysis report

Static analysis result for SHA-256 284e0bd2b674e08c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 23:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2ecd3caba2b0ef87c0e078c833305ca SHA-1: 5d1756da7db6a9314fbe678555eb45730d675e03 SHA-256: 284e0bd2b674e08c6a7311069f5c1b7d8622c248bd4703bf41b92726710e0f06
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to link farms on disposable hosting or compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The presence of a 'callback lure' heuristic further indicates a phishing or scam attempt, likely to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=easy+free+v+bucks PDF link annotation
    • http://jinsonmetal.com/Upload/file/nosopevobif.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/93287628001.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/rorutigipujefojanog.pdfIn PDF document text
    • http://selidbe-beograd.info/files/26747909783.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/57235951984.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/d04fr7tu97v8jeohc2iksr9nl5/71307226373.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3add7a05ec796477887fea0309a805c1/56750359508.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e891bed768---19220294293.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/30040904447.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/51f75c8d54e6225bf295f61fa8e09a2d/20008140787.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400eb047948---podenamoguk.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/wajavugoxuzeti.pdfIn PDF document text
    • https://equimat-cheval.fr/file/xitajusokoganaxob.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/tiregofiranudet.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/jepadunizerisoxoban.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///zatojenirotedusamokuzob.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a94353c79---11875139319.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/77722984557.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/68637892992.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa9b51665---wodomupisinogibuluwokuze.pdfIn PDF document text
    • http://winso.tw/userfiles/file/pulosinaxamubutatojodasu.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/33515684031.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_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 10364 bytes
SHA-256: cf6709c5600a5d16b109fd22b6424930729c73fcf253526eecc158851c583606
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 17544 bytes
SHA-256: 4dfb15e8a1a29c19aaab2c8af7b8a7be29957c148ee9429487c25cb4ec8995da

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