Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f69d4f8e84b44ac…

MALICIOUS

PDF

88.5 KB Created: 2021-09-03 13:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: caacbcfa6c02d65c4597becb28054871 SHA-1: 07d10f0d9fb20d93d703bbc786d617c709659086 SHA-256: 0f69d4f8e84b44acd3261ce87a550f853354e0a410ba8d9a5ddd4618d6e69405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=nasm+practice+test+pdf PDF link annotation
    • https://vetregistr.com/ckfinder/userfiles/files/gatepudaretel.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ms41d9ur0h08p88agh83a3v0nu/17701966179.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/rupelopuzozuzegilobazimud.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/xamogulovamana.pdfIn PDF document text
    • https://funbugs.ie/files/file/lajorasukus.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/73284611931.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vakobitasarirewana.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b02b1099f---polerowiwuzomegejo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/8eba5b9a91081277f5547ab836c38147/rowuvudova.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/zixegot.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/958fe7c1a42b8d41d0572c84e6f05979/zupajamalosoxajuzagaz.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd338c0bda1---72893994395.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/mukerotemenuliz.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/vdb835pkif4rvnlhdr6rqcn8uq/tasofudisanaduferol.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/rilazaxefomasofujigi.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/26505971193.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091be508ade6---25256406460.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/149bd315d27306b26fb1e58492686a1c/fimilug.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/gadaluvadif.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1317683d53---3710979109.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nnrlnlipaj17gjpajig24ju1hs/rokewesufawo.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/16991346583.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/witakosuk.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_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 18816 bytes
SHA-256: 4955abdc9d6df25e4086f19925b6923902e8a446d9bf4654a607016cdcef696d
font_02_sfnt_off00013cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAC 10488 bytes
SHA-256: 7f87eb451997232eecb0e62281ca613b11957e1d060dbb50e6dfcfa7d9a459ee

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