Malicious PDF — malware analysis report

Static analysis result for SHA-256 f499a50da9109ad2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 17:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0f4a4c7a94065f2da8d4635609cebfd SHA-1: c67d8d032b048ee8a801d4c7a6ca74fab3e8231c SHA-256: f499a50da9109ad209621c79861f8244e3b19b7f332e8bf89eaa01cb81604e08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tribo.kz/userfiles/File/wopokusufomusokif.pdf In PDF document text
    • http://innova-perila.ru/upload/files/digutuxukuzul.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/pabiropotinisapenubufadaj.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/xexugewe.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160703fec41714---bemorelameponek.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/8269872589.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/varew.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609db834e313d---tedukavusi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba98e8c5ab0---63476096805.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/gukanimerabogoranizinezi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/f6f6898370fb689254e647b29b00a298/mekigofese.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098349609e74---kujikomunonuxe.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/99813352904.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/45fd1d5c3f8a5bff033a2b1b1825e9e1/33706516592.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210623225015.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0899b3420bb0fa52288650be5a588284/36216298137.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vj92ocmkdm0a66afpajin0g2k5/17518979159.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/lirosawesanigajuxunozupot.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/faxenedatuvajexotenozuxit.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fe4630a69b37fd503999f32526d0bb21/kabovokijowukadifamig.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a303df60235.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/dimubexibibexonamijulog.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/zisorutajalelelekevu.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/kanefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+present+simple+pdf+1+esoPDF 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_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 10784 bytes
SHA-256: ce317bbc083115a6c023a40cb53dc76d6383bf9749ac65532b7e5a5ec08a1e56
font_01_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 19124 bytes
SHA-256: e47ce06856a2743e59103e3a5633b468eb18ddff311eb0d206a64f6accd92f81
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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