Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8b90362d6e4ed8…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 18:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b7c5061dd87698308ca9ccd4cb23e29 SHA-1: 1c82a5db4bc684bb9af92dd205fa262b17cde475 SHA-256: fd8b90362d6e4ed8261f4309988f96a5d9bd6a7297d23677ba65f3c241143213
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The primary purpose appears to be directing users to these malicious documents, likely for phishing or further malware distribution.

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://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611312072e97c---93863985462.pdf In PDF document text
    • http://dralituncer.net/userfiles/file/vorezokixebamofusegenesa.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/j77fhs0uen5oagvst5ervocaa4/30910533753.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/44669666762.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c94f54a5b7c---39714257442.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/xopibepolenado.pdfIn PDF document text
    • http://vo23.ru/upload/file/92601019143.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/botujubixonawedol.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/xigozidu.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/63408581622.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f8f1f6f9---rikopira.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb7033e5c3---felevini.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/dumuravifijirukere.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/14579127306.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/87024796335.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/63382382325.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/39686087749.pdfIn PDF document text
    • http://jucal.es/images/file/jaruvelowesitutusobe.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078625e883ab---19731657736.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/34105020168.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qpkfcbkl871304tp2sgerhkqkj/60548805225.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d678d033489e0172dda5c98844c1d7fb/55356067187.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/vukakogekakebepodiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=european+journal+of+teacher+education+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70D 15916 bytes
SHA-256: b95cacd93717ff5e5eb8502e2445056d9ae6003ea324c789ca379c580486ceb9
font_01_sfnt_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 10764 bytes
SHA-256: bd49fd751422fb0f5971bb2d8155c9f5628b5300215cb96ae096a7d200138dfe
font_02_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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