Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56803d14e767053…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 09:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfc82a7a59a974021e3bf10c06460e6c SHA-1: 8a817bc2bc82eaa960efe5eb6a6cceedadc0fee6 SHA-256: c56803d14e76705360c1c2b734a80463a70b0b2b82cc06821c2add85b3f13bdb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://epicridesnepal.com/files/tivatobavasusewufuwovezo.pdf In PDF document text
    • https://groupunsur3.com/contents/files/sitixarorisudotap.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/68319977219.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/48908809311.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/56829667822.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/padivofomatimininabape.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/wezari.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/74263900733.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1c970d10f87aa778a56c1060c05ab10a/dodik.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/6142007564.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/73914673077.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/vabaxuzamepudaki.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/88203323860.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/rixazofofi.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/lanovelifojogawuxixaj.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/409a6fdb44a9e31317ef3afeccdd198d/30208871561.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/zetarepetanoderugeguri.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/vomevivazipadixaroliz.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/rifodufufuvezadokukamow.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/88381516453.pdfIn PDF document text
    • http://jainfarms.com/uploads/tewiza.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/dezeforuzedixepajine.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/jakuvuzu.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/48637984223.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l4e88drnt3eqnocq9u3fvma881/vubuvuwuxal.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/gulokezap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=merchant+of+venice+answers+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC122 10816 bytes
SHA-256: a5dff7b95b8db5b5217899da09328680e82bd20edb54e676b7cf2af4520b651b
font_01_sfnt_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 16940 bytes
SHA-256: 925d715ee3e8e77ba9088cd610876ca1a47a9446006cde46bcf44270f9223c30