Malicious PDF — malware analysis report

Static analysis result for SHA-256 3315f776d5580120…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 15:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c6cea813206ca181ee4cf45f382ea0c SHA-1: 05b4a75577e766b5ed9d708177053064b6e4fcba SHA-256: 3315f776d558012043c71e5200c367c472febab47d0e4eba8eead595421d328b
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 a link farm pointing to various domains, many of which are hosted on disposable infrastructure, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e97fd4552---68698173670.pdf In PDF document text
    • http://mtkshop.com/images/uploads/file/buxerode.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/65847697734.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/25053765025.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/68478045024.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/barukifizubafe.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/2323775496.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/87612262348.pdfIn PDF document text
    • https://andrejc.si/files/file/gotilegewatitoladegibomaj.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/tijibusojitadupazeno.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/36538260737.pdfIn PDF document text
    • http://camonetinternational.com/files/file/soxuwosupapu.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/20384703079.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/lavuledire.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2d536e0bf50745c517daa144e780b7a9/44183435690.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/fitazipebejopobubugobeko.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/xelosi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9c499e780b558f289ad620b1fd962348/97293189440.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8e34d2d39---dugasokefitalixaporizobi.pdfIn PDF document text
    • https://oasis-travel.ro/files/depidudoxodurawopopum.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139502b9ff9e---besix.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/nofuderoluruvatuvori.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/23447612643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=yin+yang+emoji+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_off0000bead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 10508 bytes
SHA-256: 0f873b5d6641676a3fed66f6326e1982b09c4a715f7da0f15c4e7cd93264bfc3
font_01_sfnt_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 18536 bytes
SHA-256: ddb4eea6aafd44afc7ad7714b8173a5c4184063a1daceb932ecf11885e7e0975

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