Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ac588056b6b434…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 06:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91a7b721eff6c2b64b57c54af76c31bb SHA-1: f2cf40921bc6b4f66daeb652ec58bbc8098cb28c SHA-256: 38ac588056b6b43428cd30a403151a0608d4e38fbe037e63a9d473ea6f4e00b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external URLs, many of which point to compromised WordPress sites hosting further PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing secondary payloads. The structure suggests it's designed to evade simple analysis by acting as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/j8t3c0k6tta1k5bj9fh9ale3d4/bikajonu.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9f19e31332762dfcc06f7280e1203c1b/samisuxolilopidabok.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160abd63ed839b---2653156109.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baf6ce4423e---36669713447.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f980a415ea---nigewudovedokunolided.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/12538e65633118cb3b8b56b4c72e5d7b/galomurexekenizi.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/1677732d997d246dddd3da46123d52ef/lowezofudikurof.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5b46d2e29ce88c517427ff123c2b2ee9/rujokelixalakixitin.pdf
    • https://diphong.com/uploads/70117823359.pdf
    • https://bbpartner.cz/userfiles/file/67011088181.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab90235ca1a---lejijiveruwi.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/533ooqs52vislte65vddm54oev/pedofiju.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160da8d1c1e4aa---39604083939.pdf
    • http://csc-021.com/userfiles/file/20210622171743_f4c6te.pdf
    • http://strandedtattoo.net/file/18486227056.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/vewomikuwulafuxixagonogo.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ab60b9b39a1---wijuruworudosukiwuvil.pdf
    • http://chinamakina.com/userfiles/file/dogiwuf.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160892abbc545c---gavosutizali.pdf
    • http://metabolit-plus.ru/files/file/sakubusiliboke.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b5a8b46d---81113247097.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f64cc06c92da907c500c63fdf103320c/pudukumoj.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/75qgpshcggkjvhk84guvk54n65/putisobepofugeve.pdf
    • http://akcjonariusz.com/UserFiles/file/39351979316.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/89ee146d7223c9d73ef157338cf83bae/tosevizixamujavulig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=parsley+and+celery+same
    • 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_off0000f23e.bin
5590a182278be734d008e7039fe1712e475f91a4a59186fcb612380554c03864
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 17292 bytes
font_01_sfnt_off00011e82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 16792 bytes
font_02_sfnt_off00013699.bin
f0c582c58d7fac623cf649c2f3d764958e7bff63fd3cfd2bd0bb769aa9064da7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13699 10336 bytes