Malicious PDF — malware analysis report

Static analysis result for SHA-256 8644f04870ae9c21…

MALICIOUS

PDF

76.0 KB Created: 2021-06-27 08:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81f870fe214b5c5e18539e281c2e6193 SHA-1: 1991332451b5c38def2920e529c8fa5334a9e9a3 SHA-256: 8644f04870ae9c21c29f05dd078bf22c1f6b078aee75e21d15609f93a14c9da9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users to malicious content. The presence of external URI heuristics and the overall structure strongly suggest an attempt to redirect users for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=kingdom+hearts+re+chain+of+memories
    • https://cicadit.ro/UserFiles/file/48051369271.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9dknbuj7h283aqrvju7hr70pth/75974381731.pdf
    • http://aceonlinementors.com/userfiles/file/63051798380.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/verumopofataxozise.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/dbb6f570d53d0f4d515b2a315616a5f1/zorejeli.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad1eaffd5---88102833005.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c4bf2e896---31139777846.pdf
    • http://turinhotelcompany.com/userfiles/files/8513731040.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b81eac42e87---31846954664.pdf
    • https://arab-hams.com/Ups/files/93691060318.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a161f0c12fc---63547100032.pdf
    • http://aurora-c.jp/files/files/80650383944.pdf
    • http://innova-perila.ru/upload/files/biwul.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5e841f5a---mabogisorujofowefunafi.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4b935568e282167ee1bba752894d2015/vufojilozevesiwenevop.pdf
    • https://amatnieks.com/pictures/image/lomusozelawida.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/26169f64a7d9456a915f775c38facb4a/miluxorawe.pdf
    • http://cipetbhopal.com/webimg/files/nulirij.pdf
    • https://jetaime-shop.com/files/55434224470.pdf
    • https://tonwen.org/userfiles/file/todubesedudetuna.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ppuk7qvsmkptnjeihr6prode6j/xetifuvabejetulipel.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160804fb35c294---wofugekozijobirus.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074791fd5cbc---90588101007.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071169600549---50558971355.pdf
    • http://shipsupply.ru/userfiles/files/babozezesoxofupet.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_off0000c457.bin
08737643df103b857e5c1164efa6d59aff2e2e61e402e1a4a9418b88e966c5ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xC457 10868 bytes
font_01_sfnt_off0000dd09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 16792 bytes
font_02_sfnt_off0000f51b.bin
b5e2d812185061e1067ee59933f2e2b4194feb1abfb29b14dd645d478013cdff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 17660 bytes