Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0821f86ae8eeb0…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 23:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3700c918a55fb3aeec55a6ee6c7dafc SHA-1: 2b5a2797dd59f977c5203e65f847c8f47cf143d2 SHA-256: ed0821f86ae8eeb01b022179065caee369eedb95491520eac29e5d8f9d17f245
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm, with many distinct hosts, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=the+box+tops+songs PDF link annotation
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/41ce2ba2845f94547af02cc28b628af7/vukekituwojedazijaruzew.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/36295f045db1b28005fc0695f24d70df/dewir.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d95efb39b9946718d69603c752335804/3477607443.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0t4fdqunhsa7nc5sapa955v7t7/26719472048.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c24b82ce1a5---dovajepotumesoriju.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/25523647054.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/23354448640.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/tenaladitavugumefepoli.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1ea9b69a523d1c276950277b649e9d2a/mimizeri.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/60037619666.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/h4e0i3dvrnd5cnedetjjnbvo20/poxovepona.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/16729137410.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/280a6d8264eb2728184aed5a5366a348/bedewefebip.pdfIn PDF document text
    • https://cncunse.com/d/files/42422923624.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/logajelivosukalixix.pdfIn PDF document text
    • http://odumakus.com/uploads/files/tedanunurejijegilel.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/87559540561.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/lalokoduxovusirepuxo.pdfIn PDF document text
    • http://ahhsclassof1980reunion.com/clients/e/eb/eb0bda5e83c72ae03ef0bdd1ae4752ba/File/2587396532.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/68912011131.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/47488093013.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/85622646785.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/zevegogajovurapifejot.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 10336 bytes
SHA-256: bb3a0277fb0e3e11126458082305f8b5d3173acd7e38748dff571184d500904f
font_01_sfnt_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 17728 bytes
SHA-256: d8cd5e65eda2cdacf70bbd0f271ed94d7c3ea32dd7ea3a42a9aeb174cb874916

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