Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b183255df0e78c…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 23:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc31ea750adc9d4dc424d7df9080afa7 SHA-1: 3f649b789d12758275cc3827e3abbc87b8516c15 SHA-256: e8b183255df0e78c7a6547490755d5c4b0a20fa88c38b68c459c33524e0fc245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The primary purpose appears to be redirecting users to external, potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=cheats+xbox+one+sims+4
    • http://guitarenko.fr/img/files/54360826744.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f465d30daf---64013370740.pdf
    • https://autosaloncenter.com/uploads/file/xedabapawakojepijem.pdf
    • http://lagostena.it/userfiles/files/91751405165.pdf
    • http://alisawedding.com/upload/users/files/nuzapojefafujugesapoxove.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc20a92d5---jagafulodagazek.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c14a2e6fde---pawibi.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c95b0c151---xawerimotamok.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/db0d9107d599383cb5dc04274457beef/ridipilotilinok.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/12878587549.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec36f5cc37---52109604825.pdf
    • https://room12shio4.com/contents//files/pizabukuwasemomemubonuk.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783e9ece89b---wisiwirovum.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/6lemd4qo3kfa4m827c94i8aa5g/17520954410.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/cf121289239815d4b76f920e352f8fb3/somovevo.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a483f89191d---41434547798.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9324a8b4---jevawowa.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/77f232bdfc93b8481f567da687ea43f1/17475572908.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d8d5798a70cb78217063ea08f65f3c2c/88673730064.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/78c24be8a6f1dc55ce9bd046b123d28d/zizijetebefavob.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/zipitiza.pdf
    • http://ronaldtan.nl/images/photo/zejawasofujevutesasepup.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/molaebope5ja80cpi0unquerp0/43752416258.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f623.bin
5ff7cd2513f31f7d9b232b43083dc9188af767c1b00ed98e285dc829e83b4054
pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 16428 bytes
font_01_sfnt_off00012081.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 16792 bytes
font_02_sfnt_off00013898.bin
ab8ec89fe6b762fc181dab4e8e4664143115dee29e936c06070720dd75e4087a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13898 10576 bytes