Malicious PDF — malware analysis report

Static analysis result for SHA-256 0163d9970ba0f832…

MALICIOUS

PDF

92.6 KB Created: 2021-06-26 17:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45109e6f83704a3a6147d3f23cdd0469 SHA-1: f7bec879ba980a6c1c4dc0855a9829c1b72db65b SHA-256: 0163d9970ba0f8322981c5dc114e4180505bcd13c3bd45cc25d386b13a1f067a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. These links appear to form a link farm, directing users to other malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160774fa8b3bae---mogatefesaromimane.pdf
    • https://hondamienbac.vn/userfiles/file/38746556861.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/p0pi309oln88a0vjpl9htji7ri/zabonitoteke.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e15cbd26---pisujibawe.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc11e1dc13---67497944916.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607646cd2c885---zitofexes.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0fa931e6---92571466551.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/50445411835.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d27bdd170c98233259bc8911d9079d9f/10216040004.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/xasopivo.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ac7f0ff6c01179dcf21a2e65bde98207/kifefurulobevosu.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b0b4c91f017f3e4732a1db48628f8d09/birufapipuwizegexadurux.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1iencujqotqrhih5oato4to33j/49356565852.pdf
    • http://yongqingtech.com/d/files/29087628537.pdf
    • https://serwisnawigacji.pl/userfiles/file/fonofikumoseteb.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/81a31955ad12d93a1902f8a491cf8bd6/65852486554.pdf
    • http://evola.it/userfiles/files/23463345554.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa30f4118e---68897691084.pdf
    • http://inistor.com/ufiles/files/katawup.pdf
    • https://aslimitada.com/userfiles/file/kefawoxabudibugukoje.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbcad43a9---gatixudagivolakopafamavi.pdf
    • http://inspirationforexcellence.com/clients/66491/File/72282478175.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6fcc7410ac89f455581c6c814a7923b0/99790703762.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33a9897c9---50368320892.pdf
    • http://shinies.ru/img/lib/file/8915369385.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ready+player+one+streaming+cb01
    • 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_off0000fe10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 16792 bytes
font_01_sfnt_off00011627.bin
be7d7f05de43a5e46bb34d7f60f4ec48ebd19ccfb944ac2ddba2ad3246fa54a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 11328 bytes
font_02_sfnt_off0001305f.bin
5d942bbaabcbe1b41a6c1fdf163a22de6a8e8a925af5cd1415b0cd6d8d054c08
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 20476 bytes