Malicious PDF — malware analysis report

Static analysis result for SHA-256 814456e785341f7e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-24 11:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86a20f79a1ba58c63f676d4d353b857d SHA-1: 4ca27a50aa3eb8a099db1128f67f91d539dec614 SHA-256: 814456e785341f7e87521677711d6122a428630fa7e6db73ed52abea2b7f4abb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' in one URL indicates a potential tracking mechanism for phishing campaigns. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=avengers+endgame+full+movie+online+free+watch PDF link annotation
    • https://avigailpekelman.com/sites/default/files/file/zupovoduvagux.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/jikisuzagoluzomotujevin.pdfIn PDF document text
    • http://planbmedia.hu/files/53755657037.pdfIn PDF document text
    • https://angem.fr/userfiles/file/kezenix.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/radodeduxitagisatikos.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/70761746117.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132785edf8e8---wisivemuxesurekota.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/962d62e8205f8a19c02ad60f86ee58a8/84281413196.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/vumunumoz.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/53908967795.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/77644428843.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677f5b0d56---35693960024.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/vawuguralusa.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/43543709391.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/sipokexegiwo.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/959664708.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/dapitapabigebiluna.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/manesasariwu.pdfIn PDF document text
    • http://js-space.de/userfiles/file/letizejit.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/30864502564.pdfIn PDF document text
    • http://grimastone.ru/files/32713865269.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420d71ccd3c---tejos.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/pupesivuwiserazedogozop.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/35875407837.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/nugozobixu.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/wunofejabeloxawajitunol.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_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 18880 bytes
SHA-256: 116ba15b0571583377ef45bd5eb131d75ee1ed6820e756bec4bb9934ab13b432
font_01_sfnt_off00011750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11750 11156 bytes
SHA-256: 1421a3a8f40b9463acc647151e4c7d5ac045e592fde27837ddb0c18ee415fa5c
font_02_sfnt_off00013118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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