Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee6bc9a5271ae40…

MALICIOUS

PDF

75.5 KB Created: 2021-06-29 21:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f52420f13c69333e96539b49f14f871 SHA-1: 480582bcd6154eff0eec2c5c33851a92486e80ae SHA-256: dee6bc9a5271ae4065b5e0a79bb207d728a54cf9e2bfdeea9c7194657d9354a9
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of raw IP addresses in URIs further indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://energooptima.hu/upload/File/15615057081.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607578b37a3b4---gotelamoxex.pdf
    • http://agcslohian.com/userfiles/file/68052250660.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a640d28198b6e3ed240f4f9e063eaf06/goweloxezo.pdf
    • http://koovappadyscb.com/ckfinder/userfiles/files/kebukodexu.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a83643ced14---94093102027.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/ruxuxulolimevalumotuder.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/4545d654f2e6ad03c1f5afc6bbdca017/83248058647.pdf
    • http://t-eamplus.de/web/editor/files/82173251610.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1ea13388---63935454525.pdf
    • http://nordicaluminium.ru/userfiles/file/takekonofejomod.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/96aeb8447213f703df058b494631f190/82419903981.pdf
    • http://info56.ru/userfiles/file/37934595206.pdf
    • http://kengosushionlineorder.com/uploads/files/nizur.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/9ff8020cd7758aaf338ae25a8bfb66fd/30420468066.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceeb7563136---23404076806.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9612b2a280cde397123153233be0fd88/xetitasug.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/32562532875.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/141d1f01da6895d6c6cb7b050cef8e50/99275627931.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9a72a088b54753704aa7f5f385bdf89c/fowejomejalufofugosad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=vacate+the+apartment
    • 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_off0000c709.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 16792 bytes
font_01_sfnt_off0000df1b.bin
225f0dd45f92dcb64573e56538807810661d9d0166764cae51348d3fae19aacd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 16780 bytes
font_02_sfnt_off00010aa5.bin
d1903303b411e8c44b41d85c524b6a3c51ae5b255231e3f7675c4f9a7b0923ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 10184 bytes