Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3dfb56857ceeb5b…

MALICIOUS

PDF

115.9 KB Created: 2021-08-10 18:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0df0fe7cdab3e7a0b8b33c33fc7d83b SHA-1: 3b41e5e5b45ad6f6c3dd64adccde8b13ce543581 SHA-256: e3dfb56857ceeb5bb93080035c7f1527112490982d537e281904e94b6c8294cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many hosted on compromised WordPress sites, which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' indicates the intent to impersonate Microsoft and steal credentials via a link. Although no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=do+any+gta+money+glitches+work.
  • 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 http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb265a0551---lekulipegaperin.pdf In PDF document text
    • http://ihdbd.org/upload/files/belubanafunulanenodi.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/11830678977.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/nabomokoxafano.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7a468992e4084a7b16a9313367977dce/14088561922.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ade4f4b4188---xubeme.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/872c2a7022de30e38170b96bda6aa37c/78033202009.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982533782be---wujerenamodedozex.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/xoladefuwibewakud.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/pixawurekelel.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/xafet.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876fe7df771---4311759216.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lgq4iu3mr4n5mthdl3uftslcf1/18076813336.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/0fa3dcb298dca01435c303b1b051654c/vuwinapagalapiwon.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/8957980781.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pgbi308n9bl270ee5rvi83k3dg/35672533236.pdfIn PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/89402231318.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5debb60d1bab52514f8cb0a167c8d25d/gevitarep.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/xulejomipitobodunew.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b102f32b8---duxenefumaxudabimigusuxus.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/41741328920.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/19/file/20210519_124412_114.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/81359488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=do+any+gta+money+glitches+workPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14752 18700 bytes
SHA-256: dbccc10162b91fd1706fc6c4e79f8b029e5af3c6b4d099edcd0cfa8451876c34
font_01_sfnt_off00017907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17907 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_02_sfnt_off00018eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6D0 10968 bytes
SHA-256: c9cf0b181caed281304b8749dc7c71299a75bea5005841d63559bef14ba0c42d

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