Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8e57b6bab0bd33…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 19:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee638b5b0ba770b3db78d51aaf2ccea1 SHA-1: 603755a7caeeaceab53d5f373dc67aa442c0cc1b SHA-256: 8f8e57b6bab0bd33adb39681e39955a8ff21a269bed199dc865a9a2dacfaa8d4
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links, including those with UTM parameters, suggests an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=como+descargar+pokemon+amarillo+para+android PDF link annotation
    • https://stmarys-perthamboy.com/upload/File/22647278708.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313feb3e481---43280123928.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143345e7c6ce---48666014258.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/finupokesaxefefevidel.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/002155883445935756b71fe4420c75d7/65879097479.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/25401839153.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4lj4bkslu0lihhf07thompkjee/xibov.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/97533445809.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/xemekixiboxabosut.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/68183783740.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/lifatotanuziledorofutamoj.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/55558198346.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/99814619961.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/gevipurofuxano.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/73302527982.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/zarisejuxazutawozajemibu.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/bazenovu.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/14929179599.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/dc2e719799404e549b54883a7ba219bf/zifazizorefefezibixo.pdfIn PDF document text
    • https://yifff.se/userfiles/file/karamapafarozakalun.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/8852959978.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/mepepoxijetaruti.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/32488022578.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_off0000be9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9C 18908 bytes
SHA-256: 966bc231e2ab5a62aa1eb226b5427451abeb4cce044e708021d995955d32555c
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 10880 bytes
SHA-256: 4446c2aadfc4495b3017abd8cb687a8a96c93fe4a791397c1c9fab54e71fa445
font_02_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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