Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab8e4dd2933fb0b…

MALICIOUS

PDF

80.1 KB Created: 2021-04-29 23:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 967de76b1bd1d9d1bccb2fca9cc9e5bc SHA-1: e5e919e821672f27b435019dab3d54707e6ab776 SHA-256: 0ab8e4dd2933fb0bff73d64f3f5a26e109a3fbe7a0ed7455a9a9da7b65203c8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious 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 http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e514e632e7---xebatiferem.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607806ca3809c---22311453276.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3d0d5b009f67f4b757e128323c1aa829/xelobuf.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/d984a2594d03ddcc2c209ad054941cd1/pejuvapat.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/pc3uf8vvur597ntgk9s6m53ioa/76970592901.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9d738c153fb452c157718ba22614e0e1/xakakoxuzosadutapakaf.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16072163a355ba---rupitudapomu.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/aa62932831c959febd986f7fd9aeb221/9126108142.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d10f7a13e0---genazabemafabasejosaraj.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0b4020117476bb66372e2291f8c892ee/50866175334.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080245fc0d85---xebagatowalepiveru.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/9d6660234fdada3363226ff1de1c4b6d/30073475746.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e16778f8ea---bumudipodu.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5c9b830d---xolukinasaki.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/3738d1949a91ae16a45319b54b25cc90/76943924189.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cf5e585f7---26118939671.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9c10ff5e---2041192180.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=airbrush+apk+mod+2019
    • 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_off0000db16.bin
aa765a40d836e339357bf6327a30e32d8310e51bc33cb525d32730b0256a3932		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 5420 bytes
font_01_sfnt_off0000ed67.bin
6999791f208b39d54263255a9096e961e40ca4eda8ce111051b19576ea798ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 10144 bytes
font_02_sfnt_off00011048.bin
e02432191d952bf4ca0be4cfeafc10308785ce9d9f3781c3262e4e8a73b31f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 16060 bytes
font_03_sfnt_off000124db.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 4324 bytes

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