Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0c5cf463b42f10…

MALICIOUS

PDF

86.5 KB Created: 2021-05-18 07:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4e8a98613075e84bddda217e8425b26 SHA-1: 82b1d0742668656d0118ef44c5d9fd414e6465ac SHA-256: 0a0c5cf463b42f107e6af1354f50f7b9928142c2af8c5575e9a15580e4aa295d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880287aa0ba---95282960754.pdf
    • https://africanresearchcenter.com/userfiles/file/vepefukopaw.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/87df493408199e93a117c5b7031774eb/bodepa.pdf
    • http://alphasigmaoverseas.com/userfiles/file/67133062466.pdf
    • http://anaminfo.com/attachfile/file/76604110959.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5b10b9ce6351ae3895561340e828ff32/woxiwikinadepatu.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb94edaf1---93221969410.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c70e6fa03dfe0db88c408f0215e20270/pamafunedozis.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6209beacebdd3d0cb6ff25491633e812/gerijisadipovug.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/rqr6s4k7hqv146miu748ivtki2/99871270870.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f37f5582b5---guwijabavo.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891b9c99409---rebuxulubazonenimepem.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f1c5140a694d33f15320ad1c3f60046/tazatoxugiboremupavukokew.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/gfd9pniqlemvv66jmh2j0t8vhc/xedup.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166b4da9bc---4575496157.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c68b002de---6333701217.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986f38b7094---jelepoxo.pdf
    • https://laseche.fr/blog/4-techniques-pour-obtenir-unventre-plat-58
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sonia+tlev+seche+vegetarien
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f476.bin
c4f90066b41a64114b1dd364d7ae11233e9b5c6b7ba38410cd5d17f7bd6918c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 5224 bytes
font_01_sfnt_off00010633.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 1800 bytes
font_02_sfnt_off00010ec1.bin
01c00082bb83cee19fa76b0b3f1b114c08633181b2abf9166ec0acae12bb89bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 12256 bytes
font_03_sfnt_off00013571.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660
pdf-font-stream PDF embedded font (sfnt) at offset 0x13571 16312 bytes