Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cf7bb904240c11…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 02:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfa08596e1fa1a370da23751088c3bda SHA-1: c72e6bb4f3c5338ca7742523b9b9b0ee670dc084 SHA-256: 09cf7bb904240c11dc8347c7aca5979b89a68bbbabbd942f897fe40387463196
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which are hosted on compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/7bfe1d5d7b64f63b664fe26a086167a5/nitamajomodupikimafat.pdf
    • https://muzpony.de/obrazki/file/xumokafubusoxobodagosowip.pdf
    • https://saigonservices.vn/images/uploads/files/xuwazumunelitoti.pdf
    • https://mimpiindah2.com/contents/files/sadaj.pdf
    • https://cissud.eu/uploads/ck_editor/files/58255919529.pdf
    • https://10fci.net/userfiles/file/varogorarijamij.pdf
    • https://aradmissions.com/ci/userfiles/files/zoganokoxuzuzom.pdf
    • http://vedepcuaem.com/luutru/files/sidejevonipaf.pdf
    • http://sutipatika.hu/userfiles/files/44359186633.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131712b3432d---26711277420.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/marozaw.pdf
    • http://autoachtercamper.nl/userfiles/file/sitimowumopufuxizufafofaj.pdf
    • http://turatabor.hu/media/66784523436.pdf
    • https://giasidaily.com/uploads/userfiles/file/65465417084.pdf
    • http://vejwun.cz/images/1128123826.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/557a9dae855c4697b71f5daa164d1070/tivajotodagiruwofewixijuv.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/worubidojavopudezugutum.pdf
    • http://ebiocell.com/uploadfile/file///2021092415194634.pdf
    • http://scpt.it/userfiles/files/87457474543.pdf
    • https://dichvuhappyhouse.com/upload/files/najizogalifojidosag.pdf
    • https://krossi.ru/images/content/files/89021207576.pdf
    • https://marathonlaval.com/userfiles/files/8356623517.pdf
    • http://aelma.com/sites/default/userfiles/file/80173355434.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=god+of+war+ocean+of+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b181.bin
d227c288a8e9d52f73e279a409e0a583711775efc8d5b3938d1d7c3ed42f6cc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB181 10428 bytes
font_01_sfnt_off0000c955.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 16792 bytes
font_02_sfnt_off0000e167.bin
edaf80b5bd6b91d2a28a5a87b7d9421142c31e3a93ed5f66748aadf8dd60d99a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 14720 bytes