Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94209b394fb4f7b…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 01:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2677309c6cc12629f9e5e4ac867b355 SHA-1: f3296b4af1d8e5ca37c95c71c7e0ae77beaed526 SHA-256: c94209b394fb4f7b1e11d91c09d4be823bd527329314da8370f4c920d974392f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073dfa15493d---17898835574.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087db352fb6d---tomerove.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/79607731951.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2dd9b31da4d8cf77306749c7c8048a27/wupivakarebekimakiti.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/31410006740.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/6677464670.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/revozufejerefigeduked.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/pidumelulerubujawuritiw.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/kivaxedodanejevepoxiveva.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jopapojagig.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/wonuderimaxadim.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07e7a1b98---63182433393.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kelobalininofinos.pdfIn PDF document text
    • https://steammining.com/userfiles/file/97462196296.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/90v8h0ocebcso6a6hd056053t7/90257729876.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088610a50020---70654173523.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32ebec99c2---zolezafiwajikikexak.pdfIn PDF document text
    • https://jambukuning.com/contents//files/dumovodatowife.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/75d1825ec5a73043cba6d3ee23dc514a/vasuwibubigugudasajamo.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/kosavonogozigoxanabimoje.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/40256255727.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/sumise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cant+print+secured+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7316c7c84f380ebb0202526637a100a3/nafuranijuguvusagapowez.pdfIn PDF document text
    • 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_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 10576 bytes
SHA-256: 71235aafeb162c9033d85f3f89de0f3fea0fb797f5313ea33db2afa6b8e9e9f5
font_01_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 16884 bytes
SHA-256: 96937871555b4aaf3b0412d8bb0bdeff9454fc5250dcff1174776c178a32206f
font_02_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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