Malicious PDF — malware analysis report

Static analysis result for SHA-256 64996291d0a3f4e8…

MALICIOUS

PDF

74.2 KB Created: 2021-09-28 00:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0a98ce73f574599fb2a1b221b6ef71f SHA-1: b6a75950a6b9fbb3abdf8d45ef7fc89685dc2fa8 SHA-256: 64996291d0a3f4e8fa1c4966449370ca80b4a76ca4c95f948762ad4b18491d13
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. Heuristics indicate it functions as a link farm, directing users to various domains, some of which appear to be compromised or disposable hosting. The embedded URLs suggest an attempt to trick users into downloading further malicious content, likely by impersonating legitimate file delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://citysoupsbellevue.com/uploads/files/jusisuxafev.pdf In PDF document text
    • http://wonderful-foods.net/userfiles/file/sowukasejajirakiwezejuwi.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/47426853938.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/32071392600.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9934d0dd5---fibesarapuxonu.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/74295455219.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/20517209199.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/at04fhfq88p4bi2vqs5aavu1kt/fonufusuvawo.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/jesoxileradekuwitelan.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/banizifexutejesoti.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/rimevagemese.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/67771157419.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/93204822900.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/wibamipufejawoni.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/kufigax.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614724cd9973b---69828343270.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/65903231740.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161487caa759c1---dibosogeteti.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/fegonikikofuvu.pdfIn PDF document text
    • http://kahasat.cz/data/file/3486201401.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/17611514234.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/zuwomisila.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/xezuruwugageku.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/dagejofipotivisero.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/nefazif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+upload+pdf+file+to+serverPDF 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_off0000b541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB541 10636 bytes
SHA-256: e80142b72e37de5c94f594277120482d0514c4cf0e6b0f9bae9d973b98428a03
font_01_sfnt_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 20412 bytes
SHA-256: c0327073ff4cd1673460f6ca692f70fef56365a57034b04bc38b111430e6a64a
font_02_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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