Malicious PDF — malware analysis report

Static analysis result for SHA-256 0345beb67b6039a3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 16:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3039c9c2b04a646b54a827bed5f87421 SHA-1: 0c8e8d17a89286ff161035052ec251dbe08172d9 SHA-256: 0345beb67b6039a3cc14e3ce0f73be96e0913e470941bd8bd5a57325de7df368
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised. This pattern suggests an attempt to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=jdsu+mts+6000+user+manual+pdf PDF link annotation
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0443edff---76775330053.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/zosenitoxeg.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/80835068904.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2cf4b7368---83450495223.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/wedetinodotamakodofi.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/b6971ad4d2e0cd6b5d4c6a44b4465e60/megisifupop.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608115d98f5e1---lukanewit.pdfIn PDF document text
    • http://katachizu.com/img/news/files/pumesavi.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/63859565084.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e75409bf---poluroduzanowumakotemavo.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/20135435452.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/xozupibureravuropajir.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b6f53a2f8---baxijo.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/samapimujeki.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/xetibelidovavujelosu.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/1213479313.pdfIn PDF document text
    • https://isleo.com/i_photos/file/84388936113.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021819836267828.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/72404179963.pdfIn PDF document text
    • http://marymo.ru/uploads/files/50703139606.pdfIn PDF document text
    • http://deauville.ru/files/file/wigexikupi.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd09b0cf53b---32809433545.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0304a66e42---kubosalisulefekefumezir.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d85b1fb5---91685719639.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_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 10828 bytes
SHA-256: a5b8a94fd09bb13255ee5fa1584a4ac5012677819aa00144204c9c2e8e393cc3
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 19388 bytes
SHA-256: d1028e70f6a8bd00d9df8d2a79236b20a85e8063d0a07a8efdd100746fc983da
font_02_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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