Malicious PDF — malware analysis report

Static analysis result for SHA-256 f443ff2b2531e0c5…

MALICIOUS

PDF

92.9 KB Created: 2021-06-26 21:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 068e3881416d10ae9f271fd889ddf802 SHA-1: 1b66e07eb6cffa25fccb1a72de580ceb93eabdff SHA-256: f443ff2b2531e0c56be66b70673f628831159012e7aeef1ae8a33173099ad9ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely serves a malicious purpose. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, with several URLs hosted on disposable domains or compromised CMS uploads. While no scripts were directly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://vietthanhstone.com/images/news/file/22999224696.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608828b855729---96193490963.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082608c6c974---zutiladewurezodo.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160917788667f8---zilojavo.pdf
    • http://lhsclassof68.com/clients/73441/File/febokagazirosi.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a2qmimvo7mkf9ouqeaniudr7d7/nenozilate.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/83446697463.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b2cba154a7e1f59a30ed5456836f4e8e/wivutujebodi.pdf
    • https://whitesal.com/data/images/file/6893_20210521214834.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4bc5c30a---xitarixifujaxazaboxerojo.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745ca68d8fd---kekakefisusatilipefav.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff8f3454c---nekererodojumawujorasuk.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddab26621---13455301531.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609425b59779f---42925181380.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af3da5802---9260681692.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/530e2e9147ffbbf57eb66f86a12d61bf/kitigaradob.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092af5b7c7ab---16667213527.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c27516ec3c---63356290947.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a6fff1b13346d953307b20495ca756c6/31565575797.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608579851de05---3397896598.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/vekovop.pdf
    • http://canxetaidientu.com/images/file/lawisulowovi.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2kim325u9p50jctqfq9gqaqj6/liwapalutusulu.pdf
    • http://metrocars.london/survey/userfiles/files/34134614427.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d692b4f12---19225563377.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hailey+bieber+outfits
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 16792 bytes
font_01_sfnt_off0001098d.bin
c58e3afbe964e1e79802e344eaf4d9ea49ba1b7fbd211d14f82c5cfce6e60590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 17696 bytes
font_02_sfnt_off000137e0.bin
fc956058d45298b1751d585b2fa5837a79f7cebe0ae1c493c8b870bd158466f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137E0 10448 bytes
font_03_sfnt_off00014fb7.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB7 16312 bytes

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