Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a537bd42a8aa7c5…

MALICIOUS

PDF

73.6 KB Created: 2021-07-04 21:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2db4cc91dd007a10e4b768f873dae6fa SHA-1: bc0fd2d63c6d84df497ce5dc68de2ecc72697239 SHA-256: 6a537bd42a8aa7c576594dc7b98cc50b70811140cb44acdde2dab92b98d22146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. The document body is heavily obfuscated and unreadable, providing no direct content clues.

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://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/a2cc439e84a6d26ae499aae9fc50b457/nokevusizim.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c077c4b834e---79478748907.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210616020204147.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bab229be954---rozetarobasuzolututenafaw.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/027b219fd75b6e30a0c3a76fc7b50055/tebenigilove.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210528_7E42B4EF1F7CA2A4.pdf
    • https://lesfeesdelhetre.fr/upload/files/90696802741.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/862ffcd11c44aaaa1acbf981b0edd0df/7994329133.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5e707049a---7799869129.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16072f275472bc---majogewowujukasug.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160afceb1c894f---33219945643.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160d461fb70be0---30386242909.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/folazogofafotatewemevo.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0e5eabdfa---xoxebevola.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/90c07f4bf116881faa3e2880f06a2f62/sutoxukurela.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e0a0d434323c57552ceda7aac0a5fc49/xoxobavajugokaxewev.pdf
    • http://qzgj.cn/upload/file/64901514162.pdf
    • https://tavio.ru/files/file/42293267571.pdf
    • http://alacarte-design.de/userfiles/file/gelivavugijefulepaxuku.pdf
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/69441024259.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/406a923e31a06649e58869bc373279bf/37410301740.pdf
    • http://skiflogistics.ru/userfiles/file/53196459116.pdf
    • https://africanresearchcenter.com/userfiles/file/maxizupakapogopozin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hot+pic+boy+and+girl
    • 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_off0000bd90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD90 16792 bytes
font_01_sfnt_off0000d5a7.bin
0d0d2a5897d942c4d3c2ef161903fe367d2ded45e9c055fddbbf7b66699b4f92
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A7 10636 bytes
font_02_sfnt_off0000eda2.bin
e58d7b36ce0fe1a05012d1a0916f13cc874da8f96309523bbc8178c8c7c6da97
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 16560 bytes