Malicious PDF — malware analysis report

Static analysis result for SHA-256 e401d94fbd00673e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 16:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7594d9c8698e047424648627cd6e82b SHA-1: 326e33a7f8e8c1eb105732e5f33120d36cf3caa4 SHA-256: e401d94fbd00673e165a02409acb11f750a9bd946e92d28ad04624babac8c185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be SEO manipulation or directing users to potentially harmful content through these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/03f51a27e72fcc29935c798713e7dec0/kiworuxogesemigivabizeber.pdf In PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2607a741b23428f7bb4bdc5c9e85fc1/matof.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4859aa5781---91333052010.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/14922271677.pdfIn PDF document text
    • http://olympicwroclaw.pl/zdjecia/fck/file/gusegeposunelazida.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091e4dc9b884---libixibo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/88f6b91ae3815611f5f823a112fd4bcb/97044197595.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/tsb3bd5ubtbjl3v8233db0gi77/2018576350.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/43550573396.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/levobowonowazokakidak.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/zinotover.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/97750685574.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127369356b---33353823064.pdfIn PDF document text
    • http://haphadoor.com/upload/files/zamejadenuzira.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aiss95or6m66vekqcn1442vv5l/85854627601.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kewotawigasekorog.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/72720099388.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae1e48d490---75227145603.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/ferirexug.pdfIn PDF document text
    • http://elm3rad.com/file/30538522915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=slope+intercept+word+problems+worksheetPDF 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_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 17620 bytes
SHA-256: 2a26c415780dc69b5fd6da6f5536400d2d37fe18877482fba21f468b2a1c38e8
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 11008 bytes
SHA-256: e549bce8f19933b0a928622b37e55943c454885e6b1ed0076e314dbf329dfcab
font_02_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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