Malicious PDF — malware analysis report

Static analysis result for SHA-256 af09e4aac1c51499…

MALICIOUS

PDF

95.4 KB Created: 2021-06-26 05:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22f441fe37959d4b089b4e9b7c6c06b4 SHA-1: 45c2a41339f09164b024c8394df049b1c288d112 SHA-256: af09e4aac1c5149939bc8123b5dc4f0f902f16224cb13f4f168841ce283c20f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to phish or redirect users. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection names point towards a phishing or trojan distribution attempt.

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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/47f1258461b53d95f13fc5f912e0545d/332546745.pdf
    • http://aucoindeshalles.com/menu/file/jejemawotega.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35d442f810---29471840216.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8a6b0535991b921ffd8e7b259f690401/miwuvusem.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6845149ce79a701229ff08e3c0180ab9/nefixefivunetoba.pdf
    • https://andrejc.si/files/file/mawuduxotab.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd797db81---89713134593.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c161bbf3b---gijakikokamuvebi.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afecb2a0e90---zomonuzap.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad2aa6367---65642209773.pdf
    • https://nadamasristorante.it/file/75558395595.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a517538be16---lutezulijasegot.pdf
    • https://celebicatering.com/upload/ckfinder/files/11245758097.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3f7c5fb832b1a9e123901d58fda73abd/wapulibatajeforewikadeweb.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28f5c4d6a5---84996020015.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/e6f5c7adc5cb9f10ce8957282dae0da5/63424111766.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/j186hbmpjkdnpv5sepo8iqjrjd/42923582866.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607858723e790---46751176909.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/p9ca66a9a8rsubdemie70vgv19/tibifagi.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/deba80372c166766f7f3f527e6eaf602/raniwuteguv.pdf
    • http://tvkinter.com/file_media/file_image/file/xijolaserediniv.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddb0904d9f---95140174257.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d0886188bb7---82149938778.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/57712456094.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbccbecc86---8137544923.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=my+heart+hurts+after+working+out
    • 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_off0001105d.bin
8a45ab9ec26d43b7ad2fdcd193981987b8299a7204cfd706a5b5f3c5cafb3fb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 17488 bytes
font_01_sfnt_off00013d88.bin
765cc457ac06483806a59e11be912b60702e702bf7104a02d385e3eb084e0813
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D88 10832 bytes
font_02_sfnt_off000156a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x156A3 16792 bytes