Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34b0c80189db4df…

MALICIOUS

PDF

75.1 KB Created: 2021-09-11 22:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6dd57a161410466a378cd04511cd403 SHA-1: dcd8f576a55b5eb871b291aea05f25a2aaa2d7f4 SHA-256: e34b0c80189db4dfb8a2d1391b97a195d3aed0510a8c9f209f6735e4685aeced
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://veterinariogiardinelli.it/userfiles/files/pivikizinenupubotu.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1b306ab9e01b847fb2436e42796cdd39/duzikofixufojabuju.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/91270176029.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gebupezulibujanexinomel.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613258d36f377---fomijujajamupevuj.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/16447fd409dcf4667039b8579263c5d7/gipixoj.pdfIn PDF document text
    • http://laduses.nl/image/file/35298526011.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://czus-lukasa.sk/userfiles/file/rilonipisumotilepod.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/46975913873.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/nisuwodaxetanigip.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/veguzevemim.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/66587014239.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/37552482907.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/xiruwuminufusoje.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/7630585304.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/439676075.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/99651211602.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/joruwiwofenaweganeju.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/96796163674.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/sikeduge.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/80116149642.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/5156002429.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/xujadazubegamixibi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/d1a121e2dea70bd6aa0a845c052a9b8f/6334995641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vipleague+mobile+sports+streaming+sitePDF 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_off0000c480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC480 10804 bytes
SHA-256: f9d2fff296a42dc52d9ad9821e85680f3a8fd0721f2b881ee287fd4f43d4d0bc
font_01_sfnt_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 16124 bytes
SHA-256: ec2e1f3fe76e447316d7078da56a5e9fd49fc926d5ab8f651077d233b463c079
font_02_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1