Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3dfd148007aaa2c…

MALICIOUS

PDF

86.3 KB Created: 2021-08-21 06:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 413e0bb049f2b4e47a205fa12c60ab8d SHA-1: 1d81fae3f06968f33fe6d037c7283c1966a42702 SHA-256: a3dfd148007aaa2c463c622424503a99ab31700da8323c1322025c09212d785e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on domains flagged as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the link farm heuristic.

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/cc68f6f64507154d5bc6145dde69020e/34275688212.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/37452750545.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///15627444223.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///85530982551.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/rupawisodexosofefo.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210814_234436.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/juvexuvowipavejorino.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/soxobuputusufivegalopopej.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/gusilo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfbe49d404---jovarapojomiximilifoveled.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/h95dchior5lta85lsmir6oudm0/xizurowixupozinunuvige.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4935e46c---57691613448.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c24ae9ad7---86750558771.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/wotaxames.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/tejafimejutalire.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/66335140746.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a659d3a2---zijorokifogidapipugew.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/nekabu.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/mixoxuvenogam.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/5221p2pukhqnf4kn8dj8jjkp62/36107653042.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/3572665448.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ad91a851---norokojoxanafo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080642f7564d---xinekapajeremizogowuk.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e55f3c3a9---26595299232.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/82884c201e750dc7e8b11314b5042af4/366221076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gotranscript+test+answers+february+2020PDF link annotation
    • 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_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 17916 bytes
SHA-256: 3d994dbed3d3488afd5cf64b7f03a002dc73d8326239ca827b851e37a1961629
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 11148 bytes
SHA-256: 9d0bb3cf4633aad4447b965acec69329203891a2b4b9314000e5ad34884f2220

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