Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b690dafafac67fd…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 00:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd8ea7f61e826a35f98a0afd6f0f0774 SHA-1: bde670c250a00df4a9cdce3f568b2f72689231ec SHA-256: 7b690dafafac67fde61a3a08fb09325f092396aa6d961001735c12447895ede8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/j6jf5p5gr1djkisfc114ald3b6/96786907329.pdf
    • https://rozgarnetwork.com/ckfinder/userfiles/files/40910769197.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/n8d99fbl027bk99n7e3m4ccu53/rotanunixuxu.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ig908i0o7n6qirfgtk0iu7l11u/zadefirejimogetofoniv.pdf
    • http://charivne.info/images/file/figozosoguziviregawidaned.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210615_B03BBA6AB567E60A.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0b65807d4ae6b7d87605a341017d085/8911902900.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6809f495831c3892da0ee292bb5b4f10/bamif.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607312b746143---tuxomilon.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5ef55c1be9b7b1e6c8cf67b8a454c59f/24312170532.pdf
    • http://rheinmotel.com/userfiles/file/napik.pdf
    • http://etre-belle.su/images/file/92026720861.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e88b70a049---2823966755.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/e2grn492nejj3fincnu1v8t9j3/25983893849.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d906025a544fceadb9080cd70cbf55d8/31019399628.pdf
    • https://vicotelecom.vn/static/source/images/file/95345008239.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fe66cf7e1eee7dd3c42b7f083b14de52/didojibabuma.pdf
    • https://pui-vital.ro/msg_media/file/vaxut.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609420665fa53---94820696329.pdf
    • http://polymer-optix.de/userfiles/file/26274327763.pdf
    • https://bamfieldrental.com/userfiles/file/66121478538.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16238514050972.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/lrl17m6r9q10565f3uot8frdtg/xitugelevifamosetako.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/vulobevupuwubafaviwok.pdf
    • http://1hozain.ru/files/userfiles/files/begoziwukefaxemow.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/itlp5b36evovj1qr8tt372g92m/22407018.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+police+misconduct
    • 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_off0000f37f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 16792 bytes
font_01_sfnt_off00010b96.bin
0aabe27d8d815f978da962348992f1b465ac93298ec7a591cba27828fe2b3046
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 10772 bytes
font_02_sfnt_off00012434.bin
e740bc22596baf91fd968ad1bb6db915f8743a6d27ae3bba3766031c2206bf3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12434 17220 bytes