Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa74648d37d2b46…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 14:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31643e10e9bffe666c534ccb42f97df4 SHA-1: fd6b03afdabb5e638ef9b5fe7aeb111a411d6754 SHA-256: 5fa74648d37d2b4616208a0e72ee5330e1120d47b4491ff8828e65053cff4340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://philabc.ru/uplcv?utm_term=android+ice+cream+release+date
    • http://villacappuccina.com/userfiles/files/wodavikijafu.pdf
    • http://dostrojar.sk/UserFiles/file/92494418295.pdf
    • http://w-mill.jp/images/file/nibisiganobona.pdf
    • https://keluargamimpi2.com/contents/files/xepadovanivabulisijag.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/kumutixotezax.pdf
    • http://glassick.com/userfiles/file/250898005.pdf
    • https://bolahijau.com/contents/files/rojobo.pdf
    • http://elazentrale.de/images/uploaded/file/godomotiw.pdf
    • https://777mto.com/contents/files/jokudomiveladawuminojeru.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/aed7fb14132bb1656345a42826d21257/42060817129.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/muwevomam.pdf
    • http://materialdeestudo.top/userfiles/files/54413258418.pdf
    • http://engineersclasses4competition.com/files/others/4035282363.pdf
    • http://www.jindatunnel.com/up_files/file/dotam.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf2335ae70---50987311030.pdf
    • https://telorgabus.com/contents/files/97913425322.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136a80b3da2c---fekejemibusivozimifaxij.pdf
    • http://bioaec.com/userfiles/files/pofubepazobijowov.pdf
    • https://paron-rebondir.com/uploads/files/26650045075.pdf
    • http://positiveforce.in/uploads/files/gavuvigewabesagezen.pdf
    • http://gewald.ru/content/Files/fulewitezo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af79.bin
dca96d84bf889b35149435134696cbca5ef0ffda5cb6687fa5ed60d411ddbfe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF79 10512 bytes
font_01_sfnt_off0000c765.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 16792 bytes
font_02_sfnt_off0000df77.bin
d34533b55ade0d97853878b09b33ff7b1ad31d055ba28aa91e613e7c2e4da297		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 15628 bytes

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