Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12a241c2317f987…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 13:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 711481cdcb521eebbd05ea8a6cb9e88b SHA-1: 358cb2b0ef96476f4b0aa93f0969055d47e4535d SHA-256: f12a241c2317f9871da3c5a125bdff980d8987678ffe2e57dd11fa9ac794568b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aaykpn.com/uploads/editor/files/24943805427.pdf In PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/lizerufelivusafaveluxo.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/65537913790.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210909201843.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/82568157206.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/xetujiribatip.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/jotapisesulaxitabo.pdfIn PDF document text
    • http://belean.pl/userfiles/file/60356614952.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/25203236210.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/77920965420.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/31fjs4avrhed01a786fejma902/2163052869.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/dakibiw.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/duzazogonaputofab.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109082012575329.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/tinevupilinamikili.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/37528794001.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a492255dc1---90562124330.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/vewigisinofujozojagef.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/fagujikikunojuxazimikabu.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/90342388042.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/56546556874.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a114034548---90488708500.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/88805027566.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/5005105912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=peregrine+falcon+brisbanePDF 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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10552 bytes
SHA-256: bd0934914905fde17c6dc246d871389199be572a7f4e4685c280ee98b5caae84
font_02_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 18216 bytes
SHA-256: 3bf7ecf9f0ab4eefce48ec5351cc11c03956c7c2ed2d3a51a9f6303c2199e2dc