Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70f967be452e0a9…

MALICIOUS

PDF

90.1 KB Created: 2021-09-05 09:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 9628bed0ce597a4691ea047958b56ba6 SHA-1: 12fa6759768880e4602899da9a633da46ff0215b SHA-256: d70f967be452e0a9368015ec80600c7231502a1427876b3ce40f1ded03321e2b
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rieker-consulting.eu/files/file/makopuzedipukinazekoz.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ab829ccaf9260292bf36d6043c9a670e/molatuj.pdfIn PDF document text
    • http://miwon.vn/app/webroot/uploads/files/mowevalenafopo.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/95609785113.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/bunazokutajuxibevodi.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/90279507575.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091b4c2237e4---vojivedi.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/53133599616.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c2fb00303f362e38a0a230a801064493/61197124481.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/8step7669oon46k3rstk5uaap1/jeselitel.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/gapitojijojuzizovuli.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/faboxan.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/15342902206.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/41659afbd2c6099f79fc718271a11240/67682764197.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/33886217420.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dfe974266---65753185838.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/31028710719.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c821c818---45437015478.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734b29c6b81---79112420007.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/16473757998.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/daxasudi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6363e6feef6e83f24bfc6db6cb593519/lezemexadogipotizaf.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/nj66t5glvun1n3k8qk09bk0j6n/38327941774.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1271a3cd5---28590450560.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4e169c2c7---73747915856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=degrees+of+comparison+worksheets+pdf+with+answersPDF 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_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 11200 bytes
SHA-256: a8cc108ba97e1b63b1f8dde22fe30a2ce2a23d338ba224218a17273db83a15fd
font_01_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 18272 bytes
SHA-256: 7419d049959b7a5c053b72694f1359f70889af59a9e3414030b2363497f0d86c
font_02_sfnt_off00014238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1