Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93300bc315b75d5…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 00:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 18e0d7e44617d36963c7c01e0cdcd9b1 SHA-1: 61cc0bc4d16fe353a02d9941a1006ec229835185 SHA-256: d93300bc315b75d577460ce55395da593a3aceed597bb9a0a7d52172089d7ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains a large number of links, many of which point to compromised WordPress sites. This behavior is indicative of a link farm, likely designed to host malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/aef0dd75ec4aef93c7b0a530d820dfa8/kusevitoxa.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/7907172776.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bce2ed7c02bced00d21cb8e39b524cd7/latazefutomum.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b991bd43440---xuvobodut.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e21e21cd---67479738421.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb9165801---77164964530.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160788f151da70---zefinipile.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/jikifuwawur.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d2f87502ed8dbd23c1dcca01010362f5/7665600554.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/30943850449.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8f37e0ab7---22713465142.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ad7c58b6f---novesinagezafoxagideno.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/45dad1b15d1413727094f242f07e38e2/kikesavobena.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/cc7091bdfb9f5c77575a99a919bc9335/pitujodofofe.pdfIn PDF document text
    • http://dgjst.com/upfile/file/kigipotumoz.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a709f444eb1---vufipedoli.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/83551424588.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/kp175gj0jjtcv24nkb4meef8l0/62359180847.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/adb296ebf87d479171470178d1d9d012/21744771605.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/nodutinabuzomidewabukikop.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f99d2769302c3228712f29802eab5700/zevofukinemedebimobufar.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/vogipure.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a656fe66fc---zumurudor.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607581cf9255d---vovewi.pdfIn PDF document text
    • http://crediramasrl.it/public/file/kovijamipebofafoku.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uhcai249de28820p812s1jn7k0/52849669065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=add+text+to+image+androidPDF 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_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 18688 bytes
SHA-256: 5b7ed74b5b4d95d3816c0f0b89ff1e7f70bc85a592e2ad7ee94ac08efe0b4786
font_02_sfnt_off00013b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 10460 bytes
SHA-256: d94c1df28a2d20f711168b807888f3e32a2e46b6bca457736b6360355aebea1f