Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab216bdc0da6c91d…

MALICIOUS

PDF

72.0 KB Created: 2021-10-01 11:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5c4c5bd85a990d0f36d917ec3ecf5fcb SHA-1: e4910c122b6ae09e72301957558f6594cf48ca9b SHA-256: ab216bdc0da6c91d70be5b4a5ed91cd092b74a0070a71a66fc5d98f74c03c381
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to PDF files hosted on compromised CMS upload directories or disposable hosting. These links likely serve as a link farm to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e3bd1546---fojebosato.pdf In PDF document text
    • http://asesorgubernamental.com/images/file/61283551113.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210912_982AD57D9A564A6B.pdfIn PDF document text
    • http://novafish.it/userfiles/files/38364586628.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/71039527951.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/66723784273.pdfIn PDF document text
    • http://leton.pl/userfiles/file/82959232698.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/fd7ba1ff8db75552eeec797cbc0cbcfb/45816862691.pdfIn PDF document text
    • http://myphamasia.net/upload/files/madubuvokiwatanimasij.pdfIn PDF document text
    • http://swhos.com/upload/files/85186790384.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/87067125166.pdfIn PDF document text
    • https://italvaping.com/file/nanomixawabodo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16155ffbabe845---11655505382.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/zebizedunuduju.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/12835484514.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/89199729202.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/sojikodewuverilaxejo.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/98326514222.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/70606833289.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/87339466528.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/lafux.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/febawifasiziv.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_2AB9C2607A9ECBD7.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/kulewalesita.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/98339168602.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cc554102117f287512d282bab7c81d51/33080297175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=111+angel+meaningPDF 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_off0000b9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 16896 bytes
SHA-256: 59d2034177285296d9c917f05dd16761a509d0cbc7f6ae3a27446dc74f70d102
font_02_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 9920 bytes
SHA-256: 1936159ffaf2775728da10507805cd77a793ecdcca749805ce57bf1b6c6ec8c1

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