Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a85f97696ffc340…

MALICIOUS

PDF

86.7 KB Created: 2021-07-21 18:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1c97671daa4b8b57595266e2bd8213ff SHA-1: 27d129fcef7aa41895af8571be6e2005b0bb5568 SHA-256: 2a85f97696ffc340800975259bfb90637b654fc71977ee148d427501b1f13bde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5972a7d2fd---13324499611.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/02ab679cc915a3731ed6232caeee7f75/zetabugo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988a0e55f89---nuxagibedaxeragi.pdfIn PDF document text
    • http://bptramptour.pl/files/file/pitukunug.pdfIn PDF document text
    • https://avenue102.com/uploads/file/46210647632.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988ab22a61e---musuxonu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9pf14qqr6aso385m78m9v0p5e5/98956197271.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/11845212806.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/vosiwixupi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9a542d23---85489520558.pdfIn PDF document text
    • http://kag.fr/userfiles/file/nasupegovemiseka.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/75112477699.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/zarigalukoxip.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c520eede5---melukadowiduvudex.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e58b145ad---65006241036.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sipodevelonamalujinafez.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0sd83dsq9n5op53d61smuirb7o/wedogibanegine.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160838ea8294dc---wiredeva.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/30833326906.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/25701691921.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/kuvuwizudi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9c0707070---73329142221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=characteristics+of+narcissistic+personality+disorderPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 18008 bytes
SHA-256: e46062f66ac80b097641b96acf79d2c6242e5885da9451b3ea147811a64de152
font_01_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 10864 bytes
SHA-256: c2b832b145eda37e275ebfbbc3bc03e44f2b277ccccb1fc6539cc084d0cc9016
font_02_sfnt_off00013417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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