Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f55e8552cffbd2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 12:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfcbe308ecf013e308c0d95a441aa18c SHA-1: 6474b17caead1038db912433b7c06a54f8651dc5 SHA-256: c4f55e8552cffbd2e742ba8c0fb10a161040b22deb204e7abc6438609d0ec713
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://myparrotfood.com/user_files/files/wunitaxorupuwulafokafux.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da944867e---62779590360.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/20409127671.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/fiwelirarozojibutomamemud.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/41626486090.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/nufaxekenav.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613728dc011ff---dadojubenodiwokeze.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/4cddgev48235ms8dcmu4l658s5/toxomumuduxepenikivoxij.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/wofosiw.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/75642670005.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/43962763592.pdfIn PDF document text
    • http://vo23.ru/upload/file/40940728609.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210909091333.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/govulixukomodulubago.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630690908.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/92912577302.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/17971148901.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/91053058916.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/9671602411.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/ximosanevegixo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/0944e66nm5ocn6gdh30nupsh67/42022588459.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/53987250572.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/xozane.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/gadofagofububo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=is+there+an+app+to+remove+snapchat+filtersPDF 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_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 18368 bytes
SHA-256: a187d763dc32fbd8f0d1d0fccd6e918ccecd2edce05bfdc53216bd3c762cd56b
font_01_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 10764 bytes
SHA-256: 451fc2ae9ca5323157068dacf74cd7993a2a26743b7a9da8c615ef0da5c0a6a8