Malicious PDF — malware analysis report

Static analysis result for SHA-256 194a9f4e92a8776b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 04:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb7f9ba974cbf0c6b5fea29c50e5083d SHA-1: 1444a35bf6258f0d79dc6441e9c5450d4d719645 SHA-256: 194a9f4e92a8776b1fee689738b2ecf2d400c0691bc0257bd911cb62d8d840ea
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple compromised websites, many of which are WordPress installations hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The document's structure and numerous external links suggest it's designed to exploit user trust by appearing as a benign document while leading 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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a72f94bf20f689dbf3befa17a459a50d/satujupujenedujomivivivid.pdf In PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/56547046875.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/6416919851.pdfIn PDF document text
    • https://ikansambel.com/contents//files/nojamisoxudevukimisovila.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/tekazit.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/15683250050.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8035160aa---90944284929.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b888590dac---vupoxibolavudoduweveze.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/nupp3honsds7l0fkrnejpeg3kp/17025478430.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608856bf498c8---vovawazupu.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/bupawolujakuvalivorozerok.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/209426f449d72b071f8426b82a43bfe4/zijimesiniputitajekeju.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/981bab0b1a4a3d51041a759a0666e516/dakilixiwivebipajat.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/62096682661.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085001868c54---xapabinafosidekeniliwiwo.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/turosigozoxigovowape.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/38539238475.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/11531763232.pdfIn PDF document text
    • http://archbot.pl/files/file/98100179093.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gc1gufuk6h5e19dof9h2a69o52/padokuf.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d1874c163e9---pinidevomepetizenurijifot.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/37007130335.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/tokafofemonugegakekujefik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=good+cholesterol+foods+pdfPDF 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_off0000bf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 10400 bytes
SHA-256: 2b09a89770384be7b9c540741bbd94675935456f62f4c79a93b4f721b7aed8d3
font_02_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 16168 bytes
SHA-256: f6a91c73f54e33d692367331d087429356c2e9b2b3df96ace162a9bb8a3ad5d4

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