Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec43ea14e5bb9ab…

MALICIOUS

PDF

81.0 KB Created: 2021-09-28 08:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: abeb9f2d33f108c07d066dea46abbe43 SHA-1: c574b31d8c9240a91fccf004603d7b65546e1caa SHA-256: 8ec43ea14e5bb9ab8da8fdbff9731044a7eb1524e95d8792cb965f15fb8bfcd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. The use of 'utm_term' in one URL indicates a potential SEO poisoning tactic to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=american+government+and+politics+today+19th+edition+pdf+free PDF link annotation
    • http://toflight.mobi/attachment/ckeditor/files/ac6f088430725d15afef589fc8bfd6cc.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///wogibanipazexenosanopifit.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/mokipiwebawe.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161429cab132a9---92542340097.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/27010993651.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/badepijuja.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/sejagewutoguxokitoxexepi.pdfIn PDF document text
    • http://deauville.ru/files/file/70099414096.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/32354533869.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///87921941698.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85435124948.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/mekikenefabibikakobi.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/dewivimosivugabubopuxopa.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139b53f74d67---35644772292.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/95367939574.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/gebavotetaxekupobiwaton.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/61381935277.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/girisujogidutokogotozo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d92a49429fec5fc0adfd72cd03b532bb/paxonazafifazefu.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/51184600975.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/jasewuxetusaxalineneviwow.pdfIn PDF document text
    • http://nanopena.cz/upload/file/63946483324.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_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 20372 bytes
SHA-256: 651fb26c19c764b2cc805c20a9e496282640543aba18d459459fa69fe3b21966
font_01_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 11448 bytes
SHA-256: 899087712ef498fc5286a1be46b27c20f591bc26d6c23a02d7347b93f19208bf