Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b15db5c7501b24…

MALICIOUS

PDF

95.3 KB Created: 2021-07-02 13:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c0ecf092308cab1f154d2266d158a9e SHA-1: 4657697bf70362ea995e7285689a4529794080c5 SHA-256: 92b15db5c7501b2472d47b305b9e30a71b9a8512b24a9a8be94b3a3c2a7f2b33
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDFs hosted on compromised CMS upload directories. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d44160457c8a4cdf6ab3cfc9e79c5c09/63253209909.pdf In PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/aac57f74825233f3f9183f3e68dd06bf/marivixisejifu.pdfIn PDF document text
    • http://abnicum.com/files/file/80547268882.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607649eb62db2---20555539008.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7f4a6a85---88615802809.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099a04071f82---juxedomosafogisafosukija.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/90888464665.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/56589292076.pdfIn PDF document text
    • http://accronline.com/userfiles/file/pebuvevifixima.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f560fc29ff---44947922762.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/0bjv9saa9eu8a92do7l8g4r82q/tuvibuxo.pdfIn PDF document text
    • https://pmms-online.com/assets/file/81036232682.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/rogidep.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/oqt0shr3ajbjptqfi58l8inku1/netilajila.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/pelisawas.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e522f5bd43a94d900ba918b42db3c589/52440934014.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/31603456857.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/d31ej0qe9dga6tpih5blr9agg6/96286983605.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/t6oa2doe2gcq35n3biros9ig5vmpgm98/lilukugozujig.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c896f886c94---liwagarifejozagos.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160872abb1e8cb---dobeluwasomezipole.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/7892529776.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b723d813bfe8646ff7e8781ee9b7fd1/56744927597.pdfIn PDF document text
    • http://atomleasing.ru/media/File/81752709074.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc4eb805d---gubatemajemadavinefonal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+books+for+gmat+math+preparationPDF 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_off00010efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 17736 bytes
SHA-256: 3d27e6b525ef8774221016b658e1da887e81d50249bc17c2eaf02e51a49917ef
font_02_sfnt_off000154e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E5 11044 bytes
SHA-256: 79462916196b4fb30272cc037d47760b842e35ca54f29601c237740a01202841