Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d91fe56144a0146…

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 12:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6dacc5d728ac94915476ed25848d9d33 SHA-1: f81481dc93c3bdea93f20558a63551251aa285c6 SHA-256: 7d91fe56144a014647b6723466d334cf468528a3635f329d797aaa1b1d204639
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains. The embedded URLs, such as http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f269e32957---govozalugu.pdf, are likely used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bb51cfbc1c8---nenaretidadumoguwu.pdf In PDF document text
    • https://alkathirilaw.com/userfiles/files/41955695193.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/witewofegetugetotas.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/siwevewifubidaloxutejeza.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/jexurinovotedomakuju.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5566b0a5c6c519385f99d1ce68baebb5/84218204761.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fdfa32896c5a69d8a8cdeb38759597e9/vinivepo.pdfIn PDF document text
    • http://jainfarms.com/uploads/vudid.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/97984868199.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96650918403.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/51aa30f198a320c98afa98907eec717b/vizipewopure.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608104bd666a4---pesugukixaxupowol.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5b033dd8f---komatoxagurikim.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611119554c217---femovizegutawabupurol.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f269e32957---govozalugu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/nmhllucklglnllkq1rqso67e6c/bivezikemajotaluzo.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/weteguxivilerowox.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/wubebevo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f355ac70f8---zefelirenadesig.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/37914187790.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608249ca3357f---subudovokix.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c269fccde4f1790f9cee700a27639437/90715586390.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/davagetajadedadi.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/jureroguka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=canon+camera+powershot+a550+manualPDF 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_off0000b9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F6 16544 bytes
SHA-256: 35c6f53151d118cb7f6ffabbbb7f0953d7d4d47c61f96f1f6cd079a7ffdd2090
font_01_sfnt_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 11020 bytes
SHA-256: 16aea5b0393f711a213693b162c8b3135015237ce9c22f8529b7982434bd2430