Malicious PDF — malware analysis report

Static analysis result for SHA-256 5327d8c9259a4b33…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 23:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9db87d0a81c33def53706bcae7daef2f SHA-1: 6859a4ac0b03c0f272a4fe5cfb2cfbe3ca5b932c SHA-256: 5327d8c9259a4b33f614fe3bb5f0b442e69033eb1333fc7a3ab2f0264208c413
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, several of which are hosted on compromised CMS platforms. This suggests an intent to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://adepotcustom.com/UploadFiles/file/20210912060505165.pdf
    • http://noithatlekhanh.com/Images_upload/files/jupenapaxibamojasedarog.pdf
    • http://neuchina.org/userfiles/file/fogirafolo.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302cc479871---24010071459.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/rederarusegugixulagek.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2314555568fecd8e1e2173ceed78586b/88811552178.pdf
    • http://daiwavn.com/uploads/image/files/77850523435.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/601c53929360a3e6fe132fe48d58761c/fumejorubalate.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/70385575622.pdf
    • http://terralis.eu/catalogue_dynamique/file/7315618064.pdf
    • http://sns-russia.ru/userfiles/file/10277979146.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/rutagojoj.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614106d38be05---jokivowokuxaxiberi.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/cdca56155e40a06972eb1d67e7c8bd5e/tupijapitumoserujuzati.pdf
    • http://godsownproperties.com/userfiles/file/pidafadosurijerokuxo.pdf
    • https://stotex.rs/files/87584657260.pdf
    • https://www.truck-transport.com/ckfinder/userfiles/files/89669114848.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/sozovepelifijepuvibitaweb.pdf
    • http://cmtsport.com/pliki/fuxepumavaranimor.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/tigozufazago.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d83fb55e2---xetoparewuxodibamiguto.pdf
    • https://www.adom.biz.pl/ckfinder/userfiles/files/68502123036.pdf
    • http://liqaa-lb.com/files/userfiles/files/59210094360.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=selena+gomez+good+for+you+gif
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/03164c004900373d69126caca30e9123/15696943819.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_off0000ceec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 16792 bytes
font_01_sfnt_off0000e6fe.bin
fb089df9b1cbc82b2c022c25b7650b0e0aec99df31a1fb762d7a42c009e85151
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 17508 bytes
font_02_sfnt_off00011452.bin
6033e224bb26ba8c9b78b28e403ee84dc10ad69abfb680c036644bc333755a65
pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 10780 bytes