Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c413ff26d24a32c…

MALICIOUS

PDF

90.7 KB Created: 2021-08-01 15:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c4cebff1247667562415654f2735f62 SHA-1: e2b0769233220d86761106ec2aa04797350e3b57 SHA-256: 3c413ff26d24a32caabc68ca93efba168206fc6edcd44a4cd56f4237dada325f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=ethiopian+grade+10+english+textbook+pdf+download
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/nugafedabiviroxixozir.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/91b2e45a15d0e443cc47cdeadc22fa1e/lalirimu.pdf
    • https://efnnma.org/files/file/45472996399.pdf
    • https://tectrongim.com/uploads/files/pizebujebegatoruro.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cce898bf87---zirun.pdf
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/kubavesil.pdf
    • https://alrukn.co/userfiles/files/99041344421.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae918c214---vukokig.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/58117224492.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-2/20210502082705193408.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5c5a6733d3aaecfa901aa1a012dafb67/xikezawodejobepujisivep.pdf
    • http://hmconcretemixingplant.ru/d/files/xotexoxufejovu.pdf
    • http://ecogestval.com/userfiles/file/xofabefuz.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce6df0f7e7---7731419584.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/478f4258d6ccbf90ebc39be33e62dcc7/xufosazolugudegusapofekev.pdf
    • http://kiemdinhcan.com/Images_upload/files/rukizanune.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8v82mncm5kj6kb5b8ivp7j8oo1/falefawotivo.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a862d43e2d721cefafd8e5850d770e50/21485523625.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91350c629---33299174940.pdf
    • http://asiancfea.org/userfiles/file/70232224091.pdf
    • https://aduanaldelvalle.mx/userfiles/file/wamogepovaki.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/87913321382.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/01018fa4d3d279470ff116f3b5f13bc6/livix.pdf
    • https://www.puskinas.lt/ckfinder/userfiles/files/xakewiwevilop.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd01bc930---luvatul.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_off0000f9e5.bin
2fbf0f6c13b66a81c209b5bbad8e7008087d056f01fe38bb12bb653a9a00189e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 18292 bytes
font_01_sfnt_off00012a01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A01 16792 bytes
font_02_sfnt_off00014218.bin
5bd477d4e97eb697c636f0c06c081a1ab7755f3b6dd907187cb7bd3ad99dc386
pdf-font-stream PDF embedded font (sfnt) at offset 0x14218 11352 bytes