Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92e85b973f93fd3…

MALICIOUS

PDF

73.6 KB Created: 2021-09-26 17:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a1c5345bbcbaa2c8ebad140d7a193528 SHA-1: d560030074dd69fcbf8b727a97ce62268b7c3cee SHA-256: f92e85b973f93fd365130e5e1be6e5ab206d2c58a03095a7667975af9ba4d5c1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on potentially compromised or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

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://eakqshop.com/ckfinder/images_store/files/76183410310.pdf In PDF document text
    • http://heydarbaba.org/resimler/files/79259171520.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/xijaberujije.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/13110506638.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091721215573499.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/68051735484.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/suwasonen.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/47703766699.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/tizudipusasigafumukiza.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/fivex.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1614581c84490c---80910468508.pdfIn PDF document text
    • http://metallpress.ru/files/24033274293.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/jesisojaxuferadupivugusir.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/vaxeledufer.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/93354094346.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/48932933078.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/pudoxax.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f5aee1cb0bab17163013f338782274ec/gilidekuwojiganabosudom.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/28476002827.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613758dc2a41b---jibulobokebimotem.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/zafubumuz.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/541778860.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/70761132082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=javascript+scan+barcode+cameraPDF 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_off0000b474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB474 19608 bytes
SHA-256: 04b17cdb76a8baf55f741053621ea6a03142beacc2f734c137f23e518923e87e
font_01_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 10824 bytes
SHA-256: 0b9969f476b36261fa8ec0e6ce285f3d7b2fc10694eed33ac06f0ab773ec7c94
font_02_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1