Malicious PDF — malware analysis report

Static analysis result for SHA-256 450660dc571de6bb…

MALICIOUS

PDF

69.6 KB Created: 2021-09-17 19:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 804abe04df9471a4d7cf0830e64e645c SHA-1: 05943a96a4716609fdd29964e665771f3e73965c SHA-256: 450660dc571de6bbe66a9850f2c29bc647512e725a908a8bccf91ac6a6e9242b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to create a link farm for SEO manipulation or to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=mulan+online+1998 PDF link annotation
    • https://www.bosingels.nl/ckfinder/userfiles/files/pofuwotiluwomakalinisuwup.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/17404429495.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/fenitatifigivivenodipenub.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/61726576900.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/sijesagisidibogetupi.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/wemijeziburuweleruvaju.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/3629923907.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/bikojakujarazisumoxiza.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/mezozinuzizapibubazirawi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613613b29ccbf---jeregitewovuziz.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/monazolumefemepisusi.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/58810181910.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/95091463543.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/paxodu.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/mokidokasuvidasosulu.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///98781918991.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/b2eb921989355503af1500dece09b99d/bowudor.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1aac8e944af12337e203ca554e218b4a/3258944254.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/98282127129.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/8413473948.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/fevig.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131a36eba2e1---23821128730.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/31827422133.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_off0000afa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA1 17064 bytes
SHA-256: ab63a4c5f0850b575ecc097e6ce208178b2089a06b653cd51a4f364bba2dc262
font_01_sfnt_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 10256 bytes
SHA-256: 863fa5397e7e76ab8c804e521108465c9ac5dbd97516f5883d6f7b7f8e7da7ed