Malicious PDF — malware analysis report

Static analysis result for SHA-256 c169cef370d1d882…

MALICIOUS

PDF

78.1 KB Created: 2021-08-04 04:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9b2189d683db5dd8f045037c332ee1cc SHA-1: ffb57855d18c9ef1b9d240a6fbf522b51f98e7d4 SHA-256: c169cef370d1d882a82c8015a650f28bb30497a36986af04b43b5e4883a97f8c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document's structure and URL patterns align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://zohopin.com/calisma2/files/uploads/7704213063.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/392e318ba6f8788baeed932363b479c4/88212589515.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/67086290049.pdfIn PDF document text
    • https://people11people.com/uploads/File/2859275595.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/71804410384.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/geninaroguwuliwizivi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabf7cde648---ziboduforimun.pdfIn PDF document text
    • https://panama4d.com/contents//files/posabe.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/44010615452.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/3033906628.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/xoref.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/banotarenimeruxagejeno.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737ef995807---21239238759.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/fazamaxenulog.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/57494a2dc94d43c7e26b19b31b0d1a84/rekum.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/2162853808.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098604b8f809---29113375617.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/68310383756.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad9aa617d---63286665240.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/1959422696.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/komirarudapomatasareni.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/nojaseganajuvalugul.pdfIn PDF document text
    • http://polkovnik.su/upload/file/34123527173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=independent+and+dependent+clauses+worksheet+5th+grade+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_off0000cc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC79 11168 bytes
SHA-256: 6ece15cb26c121071b445b44a006cf8cf1f5ef9c334937ad6fa96d2b8e6b06a2
font_01_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 16980 bytes
SHA-256: 11af92ec9326fe03e1cdee77d54f0eb07d8c33a1cb81088f9b4b725e9db3dcab
font_02_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1