Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c5a44208d6e255…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 05:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c8b02bcb05b883a01674772829de21c SHA-1: 5e840dc8e9dd7d75fc57b434bed7a7056a150dce SHA-256: c6c5a44208d6e2550e033c5ddea0d54de3b183345ceb4e69f7350967af69bdef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, and the presence of external URIs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://infrive.ru/uplcv?utm_term=air+ticket+itinerary PDF link annotation
    • http://bangkoksolarpower.com/syner_upload/images/files/maliro.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b878bafffe---67749708981.pdfIn PDF document text
    • https://people11people.gr/uploads/File/jesuparuzep.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ec448l493virjpcbghk647p34i/pixivurovusodebezutimos.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/tupagatixuzojifigisaritut.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/nizitafigebemisiguroluja.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/puvededalumigunax.pdfIn PDF document text
    • http://servmed.net/userfiles/file/tadagiraweviwut.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/sezupidunexegelegafudolo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2379447ab1---bizosemoleso.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b93a9b711---43580640074.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/nigirimomubiwegono.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/2fa2e5c43addd694ff4417525648e3e6/77307066671.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/7777717951.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///29555340989.pdfIn PDF document text
    • https://avela.md/userfiles/file/83561224855.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/vuriwafurowafimemefarike.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/rewojebusewuwudedogafe.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/watamigatoxuzukitike.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/37cd524a90712bf731fd5cd16599e728/zusudunazasezelutazovuwog.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/joxadodasul.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/efd1c8863de19cc40c6ebeeb3b53bcc9/21764615418.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/209u1vacer6km0q48d9s1q0q11/15929407572.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/21944780290.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/fijowowofudarewatasisug.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a6494577---36574260437.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_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 18284 bytes
SHA-256: eaa9a529f94f9d01fe206bd9f75acf371d4b173069fe9f86b00ec920c1c415ad
font_01_sfnt_off000119cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 10076 bytes
SHA-256: 27a59b133b2b03c6423a82c326df9abe272a39b1bb250d2c4554d128337e4fa6
font_02_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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