Malicious PDF — malware analysis report

Static analysis result for SHA-256 0894639df3082c09…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 06:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fc2e722a9795f405ea2e8bd8e678a6b SHA-1: b5bb213f99aea475edc94543e6af8c014ea9bbbc SHA-256: 0894639df3082c090e88c734ebe39678439971027f35eec623d04c2da7bf7b2f
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious content. The primary attack pattern involves directing users through a link farm to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6b289de272c3ce507145e7e1a41b1745/wodigigitobotet.pdf In PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/piraduzebe.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dfef6424299---40079110106.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db0b7c2f074---42282915388.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/jiwujeragufowurofevuja.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/51389873706.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/xisomimemisawi.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/tonavupifodunud.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///8909853330.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cbd8432b0---92401306801.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/xapapeva.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb01c18918---zulid.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091dd882573b---notijexuzopojenit.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5841b25de37f578837473bfd14fb4c63/14150531945.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/fobuvesowinarelosiboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=negative+impact+of+internet+on+education+pdfPDF 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_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 17648 bytes
SHA-256: 1dbf286428cf49aa30c185fb2a9a4b5c13a11001877c3a87d6a5efee9f68321c
font_01_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 10892 bytes
SHA-256: 1dbb52b8866a3c3f7ca8649f33ddf3256741bd5611a1f10bf7cdace6b3729536
font_02_sfnt_off00012f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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