Malicious PDF — malware analysis report

Static analysis result for SHA-256 20938c9f7a72443a…

MALICIOUS

PDF

94.0 KB Created: 2021-09-14 08:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb6363e403349771ee124543f9d84c55 SHA-1: 67d63629a052ba187f3783be14a198a33ca3f0d0 SHA-256: 20938c9f7a72443aab82c8b05ac9b354f088d0ad37ca786269a6cb27a071f140
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://eatorhours.org/e-bussiness/fckimages/file/66011353686.pdf In PDF document text
    • https://matricula.arendic.cl/files/78440023731.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/jarafavepevek.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///85683233142.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/zugevowexesiru.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1e679e5f80a41afa516e85456c631e8/2869099194.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a9fa7bdaec8cf36eb3903fb014b01975/90211013058.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374c1bd7485---30845611723.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/sedenarukatexagokesewotu.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/pasevenonuziditiguto.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/62091882767.pdfIn PDF document text
    • http://sjanzee.nl/file/gatoxatopi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137161b5a1f6---geloforiwolafejod.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/biwamifufivugefuni.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/51627027322.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/vugatolepef.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/14576113329.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/80956985137.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/59122859470.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ecdab80df---22915874275.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/lebulobedadupibe.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/dijaluwanu.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///71337599709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=horizontal+distance+in+projectile+motionPDF 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_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 10856 bytes
SHA-256: 3f0668d89145acebbe480881fdeffeadc5e938ff00dbf0cc1409171c5dbd3df5
font_01_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 18524 bytes
SHA-256: 4336fcb12dd8302694de4796993978f754c571030ef16b7de2e42fb6ccb198a2
font_02_sfnt_off000151ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1