Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c24f04fcdcba1f3…

MALICIOUS

PDF

79.5 KB Created: 2021-10-15 08:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7661e131d476eff756914f7f23374d1e SHA-1: bfad7c1c858a1997260d8da02af97db40220618d SHA-256: 8c24f04fcdcba1f3598152294e9b6e7d6378c61ccbd2eba28efe54f7a6bec36e
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and ML classifiers, and heuristics indicate it's a credential phishing lure impersonating Outlook. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=physical+features+of+europe+worksheet+answers', are part of a link farm hosted on potentially compromised or disposable domains, designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the phishing and malicious hosting infrastructure findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://oniceh.ru/uplcv?utm_term=physical+features+of+europe+worksheet+answers.
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=physical+features+of+europe+worksheet+answers PDF link annotation
    • https://chptravel.ir/data/file/ratupipupamitumutijodav.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/velowovisuj.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/58942249180.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/79625488814.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/31805087567.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/94550803004.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/tavanalexuditib.pdfIn PDF document text
    • https://x-software.cz/data/file/vumowuwado.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://soundspace.eu/Upload/file/kemokorotipinigomefot.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/79178179652.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/f4lm75dkbkqo9i8rpg9up1sbd1/91632851310.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/xuvagowesepan.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/65032278530.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/7052268660.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/89155781414.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/69429698536.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3agvl2fkmhrrltvh5bv4sm0fa4/diguzaj.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/wojufunibajulosip.pdfIn PDF document text
    • https://clubon.top/uploads/files/40611878131.pdfIn PDF document text
    • http://pruneau.d2si.fr/fichier_article/file/jiluko.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6118020b6---putajepinetifi.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_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 10972 bytes
SHA-256: 327a387503d838fe6eeefc54c8b69acf7c092c5eeec598723ce2f3dd16e122bf
font_01_sfnt_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 16340 bytes
SHA-256: 929c8f216afed4c5ae849b381f99c04167af0816d79614172f61e3cf1b07ecce
font_02_sfnt_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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