Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c4f2901f36046e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-22 15:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68e05c4c1c7ca59497aa7e270023d28d SHA-1: 08ccb4538acedb54d6838f18ee94e121f6780b57 SHA-256: c3c4f2901f36046e75dd0544dfe2d02d9e93434fbbee6ad6a40cb74e5bfd3d97
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised or disposable hosting, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving a phishing lure or a download of a second-stage payload. No scripts were extracted, but the PDF structure and URL patterns are highly indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=android+app+development+quotes PDF link annotation
    • https://harteron.ee/userfiles/file/85297048611.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/55260485656.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/tiwumebonutufeluxovawe.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1241042153612ff5e4e3b22.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140394c996b3---39556595058.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/fuzoxasusekunev.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/niwole.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/ramasudapaxari.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/wumetib.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/40952934297.pdfIn PDF document text
    • http://net-marketing.hu/images/files/16705530748.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/34003622666.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/tufamigopurerazovezutorof.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161407e22ebe69---92621532254.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/mujorukem.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/84320170084.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/cj1f9r2hgujir8pagq3b4q8347/mipuwo.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/wozetuluvaki.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/94889191641.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/pirevejixejubufusuzobi.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/gukiz.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/didofewezagetowupezoz.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/nenezidekuwavujijuf.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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 10848 bytes
SHA-256: 01589d33753557273ad31fe41d302fe98d3328ffc33f63fa18a61490b5da32aa
font_02_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 18544 bytes
SHA-256: e9356e996cfac7734281bf27fd9e38e3bded70a93fdc747e522dd1e321b7501b