Malicious PDF — malware analysis report

Static analysis result for SHA-256 3212d4cf23394a69…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 20:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 411e61784ecc21bf0e53f4892cc348d8 SHA-1: 882fc0da69c6bbf6087f55f71b052de851e8803f SHA-256: 3212d4cf23394a69a741d6a998764c534366b027da949828e31fb17ce259d565
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e005f333978---79243182441.pdf In PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/71111251544.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38fe650e9---korekonu.pdfIn PDF document text
    • https://actorconseil.com/files/file/ropukux.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1629658420.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f99c4c64---12931360621.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/95845617153.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/900cfb9f481d8ae00dbe5762890f62fc/18105746048.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/49225074277.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/16081390726.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/6697353565.pdfIn PDF document text
    • http://otczenacts.com/media/files/61941601139.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b2b679e5a725d03640d29f6902a0dbff/tejifikutijipobugoned.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rloaeeablvkgcifivdhr53inl1/takinepowukew.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079217c79cf6---libezij.pdfIn PDF document text
    • http://etnorom.hu/pictures/jifozodisupugok.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/622118fc1b41ffc6953b0d00d1bbd96f/73463534333.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/sekutufiridixexodajidago.pdfIn PDF document text
    • http://word.mn/uploads/assets/vudebaxaverejamojodekip.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faad1746ab4---78447302069.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125877f958d6---80855655728.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/41782893904.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/63757102701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=coding+for+beginners+using+python+louie+stowell+pdfPDF 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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 11088 bytes
SHA-256: 60e54e7e0d92af2dde38c88f7ed022d2fed1d8088aa1d3ea1f8208d8455e1673
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 19092 bytes
SHA-256: 6c8a81c89764d86c670d70ec0ee38e9649f68ee2d1d89af81e395249ddaadca7
font_02_sfnt_off00012976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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