Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17b6a143b272624…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 15:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f862fbd96b2fe09a587db94a989d459 SHA-1: 3de937f5aaefe1660307e7c13a438698e4118d5f SHA-256: c17b6a143b272624e2ab3e6862c99401b8de91c698f7a8b6a14a60679044c7ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point to a common tactic of using compromised sites to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=cheap+valentines+day+gifts+for+him
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c6095ea075e2d69d65623e7191c684df/92665357977.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9c78khecsermeloof873u04ic1/9494356343.pdf
    • http://assushop.com/userfiles/assushop.com/file/zetoxufigepuse.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2de95f78---fogukulumatejipesori.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607340749359d---97886610145.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9dk5k04mkulhpi1n7bd0qo1oh7/bokedobodepe.pdf
    • https://study4student.com/cache/fck_files/file/43444680545.pdf
    • https://5uempat.com/contents//files/92949799058.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921209bdba9---58080983896.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607738664d68a---rotuvitoli.pdf
    • http://altinay-law.com/images/file/11289226483.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608632866706d---rowuzujexe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb800bd1b---sebifomibufipijigitetoto.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/26a3a62b7211ac847e04239e39f7e81d/lokeberab.pdf
    • http://angarakshaksecurity.com/userfiles/file/vegixobuloguverafogema.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210626_6B9858FBEC5A1912.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/20d4ecdfcd0b7d8a74c6c987cb0e770e/zedamawowonozi.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c051f185c57---kavaxonolulusadadagit.pdf
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/82247554656.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff6f0b0299---57894644421.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac565a0c19b---vajobarid.pdf
    • http://afghansolar.com/userfiles/file/vubune.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f755.bin
c9472dafdf3e202fcb72e875c7287a781d419d837bf546404d1749f92f7f2b5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 11156 bytes
font_01_sfnt_off0001110b.bin
a604979daf425c6440f6dffa42c9079779d44dc55f3e0ff85e249d550db821d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 18616 bytes
font_02_sfnt_off000141bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141BB 16792 bytes