Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f80e63b78c9fd9…

MALICIOUS

PDF

72.5 KB Created: 2021-10-01 20:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1fdff02cc883dfc452a34cb2611041df SHA-1: 0f033623ab4651654a7f8a3386c0e7cf0f4c1019 SHA-256: 68f80e63b78c9fd9a233270d6bef8e14848ae46152044d3684bd7124b8d1e588
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://multi-accueil.fr/ressource/site-image/files/39489952162.pdf In PDF document text
    • http://biogenetec.tw/image/files/20210927_233810.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vqul2hrk58rabsnk9rp263hpgr/fekebamaladilugiw.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/dotisan.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/20153862892.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/sonajafedunimege.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/60818225897.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5cab1af82d4a7c8552efe80b55419bd7/nofozopogodisesidag.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5ba513a5c0cfb13a0c2157fb707fa7ba/bububivoz.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e8fa512e28c2de0065661e7b2fc02574/5518599398.pdfIn PDF document text
    • http://carbonelite.ru/file/39442561124.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/46396465117.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/wopupedufaxe.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/baremuduruvufetelufin.pdfIn PDF document text
    • https://cabinetscounters.com/ckfinder/userfiles/files/25383903188.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/37413f71d818360393d9cf618ba00728/viwiwebonigik.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/rapoladegebumukewi.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109151400581283.pdfIn PDF document text
    • http://mlead.net/images/e/file/13934026526.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/puzigeladodenetib.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/14070820452.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/88586607966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=leo%27s+fortune+apk+obb+downloadPDF 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_off0000b35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35D 18344 bytes
SHA-256: 75af9949aa4bca0fabd14671879b4a1596a8001147b6f2833492a8609126d409
font_01_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 10808 bytes
SHA-256: ab8bb5e7d9bd0f78c4316149faa91722ef6b82334fe1f88096c3283a7b66be07
font_02_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1