Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4d7c304d371ff0…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 11:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 49123700294d0508eac54203f956b1bc SHA-1: 38eb40fe2a2446a3fe2958c62ae0ff2ed2a71313 SHA-256: 2f4d7c304d371ff01d6684fda9500242c3d98c43f14ab24555065749bf09230d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not containing readable user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://iccj.jp/images/uploads/fckeditor/file/fugulugatujolaru.pdf In PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/76419227884.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/88174840574.pdfIn PDF document text
    • http://keacg.com/upload/files/56784523352.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/38494365844.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/julodomuf.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/4kdsivfb8o1026q49f8ldrabf5/bapuzulesizi.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/kuremegefu.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/waruzelukitamik.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/varaxodutari.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/98f43ec7bd31eb5dbcc414c93fbfb58f/3057353417.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/4247599775.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b56223c235---47835305993.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/34878776543.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/mi3v697ci1gtpreul3s6579sqg/dagadebesosefalezidasipep.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/kesuxiriforawowutubokiguk.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b31de85fba5---fexumubozuz.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/49216999419.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/79408411406.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nudikud.pdfIn PDF document text
    • http://espokebar.com/uploads/files/morumefip.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fjs434dlpp0r5l6f6tb5p185r6/funivepebazilekep.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5aa86d1ba---jijezupafim.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a782b3f5---76809878927.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/79848284173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fem+simetri+ygs+matematik+pdf+indirPDF 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_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 18908 bytes
SHA-256: 982e10e83f5fd7df7c809fd2102037a0ebfed1ba06c13200d828d4b959070593
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 10856 bytes
SHA-256: 7b3911929fb07f91cf72ca0a672df6262a1057c9951d8d80579d97c250a84da4
font_02_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1