Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8fb4bb6fe05d3b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 13:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f5806c829141ac62677da0467559b3d SHA-1: 0900188ad9693c5fe0affb609133cda6d92b7b5f SHA-256: 7f8fb4bb6fe05d3b90dc18c66149330586a2ce6ca18d37b63159091385d1255c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=aquascapes+game+for+android PDF link annotation
    • http://1utilaje.ro/mm/file/83340174171.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/67607486199.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/wixejaso.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/92718481526.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/18433289916.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba4ce4ad44d1ec88400046e6d6525a0e/71337833782.pdfIn PDF document text
    • https://aaaxxion.info/images/file/xawisunazoxot.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/47e9a904b64bfefe76b97c93830364ec/22922494377.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/64569086808.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/kijovoragazukakuzowu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328f3a35f15---nevebotobizavuruwes.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/busesokeban.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/71441624725.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/tumipixudininakuriketep.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/dejasufa.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/vebobonibuxifozarowazuxar.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/fezebep.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/56644786074.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16130286b1ffd3---podenipobetatoluzatapeliv.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5dc35aef4---gaxibimasixoduvosep.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/1745636936.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/79130074406.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/67043787845.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/36558696300.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_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 17144 bytes
SHA-256: 82ece12c4e2873dd66ebe80ab68e575ae18d7e77564fe3c39b3625388c50a074
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 11048 bytes
SHA-256: 2682a2fd658c2d739b24217dd609a4758f056bc266d08a3db738b50f38734a60

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