Malicious PDF — malware analysis report

Static analysis result for SHA-256 203efbed93db5f0f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 22:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b620d1b7c5fecdfb47530d83fd68de6 SHA-1: 8d656e283754d4fd3cd012ae9156ecf1666a073f SHA-256: 203efbed93db5f0f02062e04fa4643cef4281f511a9f747bb8927bde00fbd977
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials or abuse multi-factor authentication. The embedded URLs and link farm heuristics suggest the document attempts to redirect users to compromised websites, likely to facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=google+pdf+viewer+apk+free+download PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0dbda9330---36601667914.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4ae1512adf2d19ebb59cf866a7164c87/91290131380.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/0a18d9b284f7908e55c43b876e818566/56285037402.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/95028080654.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/48524089974.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/fudesanatunaliwubipasava.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c54f57a21c888f74ea62246de70559a2/maketeridunedodunuwekos.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612676c7634fd---bivavajin.pdfIn PDF document text
    • https://aspirans.com/files/file/mikuxosimugewez.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/f18e5697c32b735124e3ded4041a9aac/pilojumujekewazetegijo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16104f876d33e1---vofunovuko.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvozamefu.pdfIn PDF document text
    • http://nanopena.cz/upload/file/pulerufowewovat.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc04e0aa76---49222925423.pdfIn PDF document text
    • https://arerp.kr/data/file///67153192176.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff495193f6---1548538591.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f0585359851ad49fd038a8b4d9f1af5b/98516335509.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/lezazef.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/20312950736.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbeb55605---derufudebidixap.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7254860fb0---gutoduwemegugatus.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_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 18072 bytes
SHA-256: 59032fd57153e81c04a6277068b0620d622671d5ea3d67a6af0c9c76a5267ead
font_01_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 10688 bytes
SHA-256: 85aad0b0cb089a3a172681919643da33b8ae6ceba469ce3cf105de205c2ca3f6

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