Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa964746bec22ab2…

MALICIOUS

PDF

86.7 KB Created: 2021-07-13 16:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d14848bf87113469257b0bb328802f60 SHA-1: c1871f8197c266281a5e04fc1b32458d284d41fc SHA-256: fa964746bec22ab2832f30a906c1417990a538f902c080a643e02653e9505537
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as a phishing trojan. The ML classifier also strongly flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16082e77b4e5c5---kufojedibegijixomipilav.pdf In PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/33666938583.pdfIn PDF document text
    • http://lucann.com/Upload/file/dibizotedopopamebilo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/92659785060.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2815d38617---wuxofimerejoxumajewe.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/1121255902.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/7f6c122dce1b58a2000860f31ba6ab07/28151638098.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/92d395b17fa5562b32a0d9e4da0d1acb/xelosuzelusefumex.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3ab184989040546f68a8998c70004ed0/kugobu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14a4e9a04c---wojusudalajozaja.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e0489998---pezojowaka.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/98250080b02f94ea9a8d3d53dc4a0886/28886351160.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762f1f11326---92551061934.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/mubaziweviluzo.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/sajusitalofuvujozi.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/46080343791.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b43342cd03---91879941362.pdfIn PDF document text
    • https://maisonforville.be/documents/file/jatupesevonitefexozor.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160703fde82589---fefawexajasadelaji.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd00a4907f1---6814951693.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/tuvuk.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/tojotuvarazepajinemesof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what%27s+your+weakness+best+answerPDF 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_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 10624 bytes
SHA-256: 838be128d69167c23dcf4575d23dd14985387c781d31a294017d8ba73b4aec8a
font_01_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 17588 bytes
SHA-256: 02cb8822c45c2f7666cdcc23654f9637c73bfc03af8e53eb3fbe405cf7b061f5
font_02_sfnt_off000135c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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