Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a1e6d4bbdf3e76…

MALICIOUS

PDF

74.2 KB Created: 2021-07-16 23:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63370536380fc1e00b1c791a44cfb751 SHA-1: 168453860d5d97a0c7d2c5aac192973953daca82 SHA-256: c2a1e6d4bbdf3e765c3478af72531a0cfff609e9d61e93b188a11280d28af01d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088798d42372---47472126513.pdf
    • https://yingzhaoliuart.com/upload/file/19603781499.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507053204355329.pdf
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/36312114515.pdf
    • https://kodcomputers.ro/2664/uploads/rimanos.pdf
    • http://pronobile.de/catalog/file/20149759813.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-22/20210522164400761564.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8040fe34---79302959896.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/6s42l5q6196q5gffk1uk9dolll/fisuzuvalasiderajidewomi.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c5edcc5cd---15677855560.pdf
    • http://campbellelectronics.com/uploads/lumitudaf.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfdafaa700---46875552687.pdf
    • https://btegypt.comfile/59316784486.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/an1q2gingg0cpep9h0eulubkq9/22481402992.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cff81eede---vobemafiwiribib.pdf
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/birabigikot.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c8e68efe46d93816ae95a540895cd954/24523568194.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607434ed33c53---57315259403.pdf
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/vosijobi.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8407d795be---56929839267.pdf
    • http://sushi-belovo.ru/files/lanit.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080749e8c879---nedozozedabul.pdf
    • https://bluza-shop.ru/content/File/sadakero.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=clinical+chemistry+tests+list
    • 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_off0000c2f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 16792 bytes
font_01_sfnt_off0000db09.bin
5551ec980f4a799f2a8711c34acd34e2f6ee3962850148ca46e251ef7281ccae
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 10520 bytes
font_02_sfnt_off0000f2c4.bin
2c641520da81941048e80eaf20a7ee354790051f3502f1624dcc37aa973cad36
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 15940 bytes