Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8996ee616df71dd…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 05:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04c788d7c79f5e6aaa6bc2f4a0bdf656 SHA-1: ff809944e1874ce651cc4d206b5db75f8e0b1eaa SHA-256: f8996ee616df71dd78a4e27c3bb0d99e9e232202fe5f06825bc321f6b84c2f9d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is classified as malicious by ML and ClamAV, and exhibits characteristics of a credential harvesting lure. It contains numerous links to external sites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to distribute phishing content. The primary goal is to trick users into providing sensitive information like one-time codes or MFA approvals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://aprenda-atdi.com/uploads/files/murep.pdf In PDF document text
    • http://pegastelco.com/pictures/files/88593107684.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdaf48e800---15458839599.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa04667a95---62054129802.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/91651968489.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109140755201613.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/43172921438.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/rezafanipovikavifobara.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/nukegajis.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/wepeveraregixaxir.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a4fb5f69a9e20a01c710791237b6e4ab/21224566344.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab4873769---803778431.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/91738154959.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce6b10b121---dimalimibaderidi.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/69702576025.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/14502914697.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/32177541086.pdfIn PDF document text
    • http://www.agot.pl/upload/file/sekirikabipofuwa.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/tekesimuvafe.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/m33c0b8pc75bo7ejepkauop7fu/noriwabigogajut.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e09877d34858db342373b8eea55fa1d9/20737884553.pdfIn PDF document text
    • https://hgb.se/filer/file/zogeba.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109031029526062.pdfIn PDF document text
    • http://rjt1.org/upload/files/nigaregokaworoturag.pdfIn PDF document text
    • http://mutitar.com/user_img/files/1334649403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sites+like+mr+instaPDF 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_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 10316 bytes
SHA-256: de6ef262ce9229c6c8efb62f3390a7829416d8a354f392f0faf18ec31092e119
font_02_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 17812 bytes
SHA-256: c922e06446a35942669da9dc7d40b5b5d1f738835d351e15c6bc83a15ff307e0

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