Malicious PDF — malware analysis report

Static analysis result for SHA-256 87af9dd01df4a04d…

MALICIOUS

PDF

104.8 KB Created: 2021-07-18 10:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06819d0de192ec974a0661414395f7cc SHA-1: 691792d9561d74e919c25a6b43a9e2ebcd22a87a SHA-256: 87af9dd01df4a04d64ea9622da93628402c65113b783047b6a40338c7951862a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ln4q93j1gp1vlr4tr14vaj7l0b/ganobigegekipafamopo.pdf In PDF document text
    • https://securityguardsupply.org/php/uploads/file/rexafosasuvozod.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/20vts7cdsaslb2ke3q8jmmrcis/94230063801.pdfIn PDF document text
    • http://polletnv.be/uploads/files/lukuzewigol.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d03745720bd---23173439880.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/64511080277.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/6nvmugnt7fnnpc2pfflh4pjis1/bipifadapebatibokenuwaj.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/26473816141.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b50c2a0bb---ditobowatufovagabadutuwig.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/vomivevepetunaxuf.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/j77fhs0uen5oagvst5ervocaa4/30910533753.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a038b4624---26949144168.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/6mdabaib379rlkun7aoa7dhk2f/31475639037.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/5o4qvf8fgvidhr695m5a0odkr3/rolaseponidakupetama.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/tuvaposabukuzivagukezepu.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7b8d3803a76e574d340d17f7f954c94b/mosatobu.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/defidomafal.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/632e3b311601fc040f3722c1b8be09e7/rinunijifufavusarubibotuj.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cefe47e23---81566350317.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/10200038011.pdfIn PDF document text
    • http://freeski.hu/freeski/file/peranipufurub.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9c573863---94208178137.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8910c7ff---luzodama.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096713eeec17---47486313800.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/165801db739d222909dad837174e6fa5/21100213415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=disaster+management+plan+for+firePDF link annotation
    • 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_off000136d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D9 17364 bytes
SHA-256: 8f8168386dbed193018b456a3da731a627e9a9eee1560d32bda9aa542ae6dace
font_01_sfnt_off0001637d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637D 10704 bytes
SHA-256: 0a548fbca36c9ab935340dedba2b0a7ca6adcc043038c671f691bf641164ca5b
font_02_sfnt_off00017c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1