Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afd4156e959844a…

MALICIOUS

PDF

90.9 KB Created: 2021-06-28 13:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b78db795c0757f206f7a038fc57ebcfa SHA-1: 758765b65a8207d70835c0cd93d41ae43e71a25b SHA-256: 6afd4156e959844a29cca3ef5334f55eb1f092d55e84f86ca5847cb30911c9ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the use of disposable hosting for link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8d8b2763240dcf70660b3c9787fb18b0/pefaritabadobibogemaz.pdf In PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/j8r07vfitl438ahgvq3qr3obv5/lagamakigadaliluvuzutude.pdfIn PDF document text
    • https://bnovum.hu/downloads/39762792926.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/jorosevafugidopukupagip.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc9c25c834---67315184802.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/63934070238.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b916b33b32---9202703766.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/39584380920.pdfIn PDF document text
    • http://dnepropress.net/files/file/netusuvajige.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/sigibazemakovexum.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c9c7c48f912b95d3a6290c12bf30d02b/17660903778.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/lntpaurh30d6l1314b5lq6b7r2/nonaxiwese.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f9827f5d0---mizusi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/fezipagokez.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bf9dec10ceec6a7c31e1b7462e0bd46f/32931423310.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/nilawute.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/potabokazowamepob.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/41c0d6cf0830fc80364098fe99acc9df/34324189485.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb908080c---xatevulugasodipamubuwewas.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e67bca55---67866707377.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vakipozarowikew.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/96577306886.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/xemerarutitafe.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/108a1290dbea14304b9c5a005e8687c1/pobuje.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/88616973880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+coping+skillsPDF 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_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 10464 bytes
SHA-256: 98da614284f4288384c762b905880a4b7bc80d4077b1e57c37d456aae3aa593e
font_01_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 17036 bytes
SHA-256: 7dd4acf9e664dd8dd6155c642648916ba1ad35bb3933cebecd52a421b274697b
font_02_sfnt_off0001462c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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