Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38cbecd249df02c…

MALICIOUS

PDF

80.6 KB Created: 2021-08-02 06:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5b7b2c7d3f629c25334da1abcbc083fe SHA-1: 1f22deda28601f387094a41946e9b8ac27177e65 SHA-256: d38cbecd249df02cc3eded1f1f8f52279d00aebab48e8eef2df006af02c8caed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly imply an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://allytemp.ru/uplcv?utm_term=peux+os+xfce PDF link annotation
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5qv2lncrlcsjh6549fpupuuus4/82289397982.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/39044677616.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/zibemo.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/18282545438.pdfIn PDF document text
    • http://standdominica.org/files/files/53681444167.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160796de7e74ad---netuj.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c1eca91d850a6573fc068aadd18845cc/jadoboxagutalezu.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/86937309999.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/b99qu1huctr63lke85r4v9e4sr/fepesonawu.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/pajilutemosugijijaw.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/24777377679.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/fololik.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/zofos.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zeluvedolej.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/wexekakigufaniralagokum.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ec649c6aba29a778d3fb7b1b508592d4/gazegenixisojujudu.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/16976580137.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076373345b9f---dilevujol.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/pimesutanuduvowoxa.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160901bfe6159f---jabipezen.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/luzewaluzama.pdfIn PDF document text
    • http://rld-carbon.ru/file/10398009623.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/pujat.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/detixebugawuvekutewuva.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabe0879b5---zexafunomewobosogax.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_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 17784 bytes
SHA-256: 96bbc19e43b31d13c6da0540fad90e224db4c89f25af8dcf989ce2f17f1eef8b
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 9932 bytes
SHA-256: 40478513ee050693831d3827013e5ef4e068ab73951e8abc0ce178437f615e7c

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