Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca961503cb38ffc…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 02:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1eaf314d62237373c827b8c9715c6e2 SHA-1: 0a1d16c114463842ccd99c7db6a8fa5c187a1c27 SHA-256: 6ca961503cb38ffcb61895be5e8a08585427d287f4470f6e8e7b194ec4db3021
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and a link farm heuristic indicates an attempt to distribute or phish via these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.smpnuenen.nl/images/files/16017098099.pdf In PDF document text
    • https://martan.es/cenavarra_userfiles/files/41967806900.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/09c9f228d0db311a74107a2fdf9f66e0/vekej.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57798103276.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/pugukusi.pdfIn PDF document text
    • https://invision.buzyhub.com/files/62300392458.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dad590881f94a1f8e7601fce284733db/rajawozozano.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/67558197933.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/33843811609.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/50902517022.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/dojosodevetaturebu.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210904_8DCCDA3675CD86E3.pdfIn PDF document text
    • http://355353.ru/userfiles/file/nipedavoxazuwoxi.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/papitavogelaxo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa0e944be---kebot.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/62795906384.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tigoroganizikavalaxoj.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/bojigujamireda.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/kitidinimekivozekad.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/pasarasumokuvedijitowebam.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/993bd1f25e89b7737e154e73b7441945/dolopik.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109051021335163.pdfIn PDF document text
    • http://grafitym.kz/files/file/74953201751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=number+1+shooting+game+in+the+worldPDF 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_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 11052 bytes
SHA-256: 4ca5684df7a39e772d061f5e4c9a4c869edd10000be682039641977e1cb93599
font_01_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 17592 bytes
SHA-256: ff268404d4e091ff7ba7a361dab1d82728b9c3c9278f2f958925ecbba7c036f6

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