Malicious PDF — malware analysis report

Static analysis result for SHA-256 9690f91cde345d03…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 02:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 587a4f89903f014d8b785e73d28179de SHA-1: 79cf2500b62bc98dedd36fb65f88ffc7020ca861 SHA-256: 9690f91cde345d038d45e1767fb3603d5dbff2abeafc2a5757416cca871bc900
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting. These links form a link farm designed to redirect users to potentially malicious content, likely for downloading further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cargologicru.com/sadm_files/gutadiwexaki.pdf In PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/faxel.pdfIn PDF document text
    • http://spakimthi.com/upload/files/52337650189.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/60904617044.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/80588452713.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/ganowojixojofiwekabujir.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/74206245370.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/74323983775.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/5198241838.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b2cb6f462824c08d1d73f45eb595389b/dejubimazemixak.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210904160811_991604190.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/71668003224.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/75455915794.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/gozowuraxabewunozafamiwu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/58dcc7e4f2e1f73fc10b0cbc4486c5fb/dixefenofelomibo.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/pitagavuzil.pdfIn PDF document text
    • https://krusomying.com/data/file/senowopopuguro.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/powovanafekimogifuginanu.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/pokagemo.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/wijoferasibigu.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/dosowef.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/74350135806.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/fibozuvisore.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/91861145216.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/851d35237c26a7a7f19253787f9125c9/xupegegowekimot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dslr+controller+1.06+apk+free+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_off0000c38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38C 11108 bytes
SHA-256: 278a91d803b0152980353a5a93322a0367d6137c948a87b7d0fbf644641f8d40
font_01_sfnt_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 18608 bytes
SHA-256: fa444b63b332c38cb5b04a17520c50a614c5c33b31699ff201c23900375b8118
font_02_sfnt_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1