Malicious PDF — malware analysis report

Static analysis result for SHA-256 c897bd91b304fce4…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 13:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfc72e47c62d29ded32ed424e4db7878 SHA-1: 9fb1d9375881670d0ccfc0998dd0a791b6ec5f65 SHA-256: c897bd91b304fce4137614946ecc48165ca3dc6106fee9980429158cca190490
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple links on disposable hosting and compromised CMS uploads further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=tamil+2021+new+movie+download
    • https://shopinhome.com/ci/userfiles/files/lisodiniwulirepovo.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a0df005f---kagotiluviduxoguti.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/jisawagavixibubuki.pdf
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/vidolima.pdf
    • https://actorconseil.com/files/file/67501399343.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea7f7f0190---mokep.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/3d73c68d174385c7648c552a05dc2ffb/74904323228.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2193991f7dfcdd57ab7430e1f7735b10/dovukuwoxediw.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e75ab342bb---niwepesabifemored.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607284bd097ba---lifibefumavinika.pdf
    • http://villa-carlshorst.de/sites/default/files/file/zonur.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cb07d81abd6---84678968644.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bcbf8d766---lebifawufimobukefaj.pdf
    • http://e-district.org/userfiles/file/xitupefamuviduva.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a144a30f723---xagokuvibijif.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a622cb76fec---93545995703.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d79d76a30c7e225adea51bdfc161e230/18404347129.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/kifitipexibidekiz.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a934474b955---sokexetulurekasikuxem.pdf
    • https://intellicapital.in/ckfinder/userfiles/files/11945660840.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160820c29cb610---dorojuresufugajumegufi.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/xijedejiruvukode.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_off00010161.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 16792 bytes
font_01_sfnt_off00011978.bin
d53f9550c9c2895b31f6532e215427c488e877e7632a666859fa7e9bb08148c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 10452 bytes
font_02_sfnt_off00013138.bin
1f51e22cb2626bf5741c204401eb52d8de05c7186cdb985bd0fe1b3e8a161b13
pdf-font-stream PDF embedded font (sfnt) at offset 0x13138 17128 bytes