Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3301d03a554b95…

MALICIOUS

PDF

92.7 KB Created: 2021-07-15 20:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 564f4db16ebb37d745e9e5e1c752bbcd SHA-1: 9514e1f4223d9adc76bca35db766c881a387d407 SHA-256: 8f3301d03a554b95871c90deccd183c991f1d7c940d797d484029f7866671be4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=my+free+cams+adult
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a11c78c9d---gajepakuv.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a49edde575---17108910759.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/rsgt7sn1tul7j5m076dtsl9oq3/riwabumuputefigo.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c772aede45---vifesixejifakewuruda.pdf
    • http://bezagsecurity.cz/userfiles/8842287332.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0d33bc611163d8018280e8cec6277b3e/37582102453.pdf
    • http://stin-verdon.fr/assets/Image//files/1232573723.pdf
    • https://actor-conseil.com/files/file/rasobos.pdf
    • http://palaciodelosnavas.com/userfiles/file/regider.pdf
    • http://childconnect.com/swi/fckfiles//file/72575297745.pdf
    • https://dukra.sk/editor_uploads/files/sowokisepasusafugekam.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/44c5d97b39391616ea41c5e959fa9d3b/53212131576.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c95a14a5---tafujasevemikeja.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3372d2fe---vupupan.pdf
    • https://aprilboya.com/userfiles/file/voxogigizu.pdf
    • http://fmi.lu/userfiles/files/jipenitera.pdf
    • https://penzionradvanice.cz/res/file/38639097457.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/51708700046.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3278ae320e23c35ebad4616ba997f6d0/14637483820.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc0c61bd6---vofesifilujidopuxota.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/l4l3nptce26u902s3nk4ke5qk0/rusonuxurafedonisuwafun.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8b455622---xepikivavivanise.pdf
    • http://70sromans.com/clients/871711/File/4510630258.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_off00010614.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 16792 bytes
font_01_sfnt_off00011e2b.bin
b124b1f98051fcca07c322d1aa93f51b533438d1d5f415a4826162fd6868caa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 10528 bytes
font_02_sfnt_off00013642.bin
b58ddebb5f2bf72e0431a349d80957f51e7519b058903153450c456eb5cd375f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13642 18020 bytes