Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92a4cded093778a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 03:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b60b0fb1cf4903f3536cc7788a581877 SHA-1: 24a72252c4fc0923538d5d6d66cde44fb12be9ca SHA-256: f92a4cded093778aaa4878162e06bd9f11d230935e6e122e43fb998bdbb106cc
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution lure. The presence of external URI and link farm heuristics strongly indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://wastran.ru/uplcv?utm_term=cheat+euro+truck+evolution+simulator PDF link annotation
    • http://bioscipublisher.com/files/upfiles/file/zumipex.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/28860343893.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/jukufetilodapi.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/tudinowori.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/kogabolimekiwamanutapi.pdfIn PDF document text
    • http://fitviewer.com/files/file/35537545532.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/25987370991.pdfIn PDF document text
    • https://ayurmitra.com/files/file/48658394909.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/1517003236.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61353e17481fa.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/40530490590.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132982f04243---52039494846.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/vifufugilowagineseki.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/mewetef.pdfIn PDF document text
    • https://lapakunited.com/contents/files/15880004164.pdfIn PDF document text
    • https://5udua.com/contents/files/sojajizirojijataxub.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/putojodesemaxipisolule.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/lerelelojis.pdfIn PDF document text
    • https://netlandschool.cl/files/70417074774.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/54ca1043374ccb98642f7df34662c091/kabuvevupobowunimivexil.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/49005700937.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/rigebemesavowaxufeniv.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lupawaxigipinur.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc624d19c---fuxafi.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/kazipesogugi.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/48842383960.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161398fc4e6651---budupozimuganotalupubera.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/juxulixixogurinuzud.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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 10784 bytes
SHA-256: a58a7e98881562aa3964284ee09c074bcaf95dc4d9aef7723e13c039da4d3286
font_01_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 17896 bytes
SHA-256: 3591596330881e0b0ec87899ed5d56110fffbbe76bf18076ad7d2fd6b5c39edc
font_02_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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