Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8816867d63dc33e…

MALICIOUS

PDF

77.9 KB Created: 2021-08-12 06:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e5c8a77d90f22d662c668868682109c SHA-1: 7f9db79f46cbd2669c28ab5a904f920e370b1ba0 SHA-256: a8816867d63dc33e482d7657c7a8863fecd1d9d84d21d0fe92db2559be87b772
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to manipulate search engine results or user clicks for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6937

Heuristics 5

  • 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
  • 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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e144e152---39831657627.pdf In PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/jifoxoximelosixulob.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/25384738676.pdfIn PDF document text
    • https://rcot.org/userfiles/file/22822611076.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161052c5879cc5---najufalefexexudovolaz.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072758b25fd3---xuvepujej.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/91rn84kgvilsr816o3c0b92qfo/romoworumedore.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f420b08e1b---7886774654.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161037fa5aeb02---39575854994.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/xokupabavowagelux.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/bulisekewibezemurewuz.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kevemoxiw.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160925cad2d77b---11804770910.pdfIn PDF document text
    • http://yuha.be/_files/file/juvatatesoma.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acad076f77d---gafukevuzuwemuboka.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jagb9basdn63uu8104rh05d7ob/83892264714.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/19084d06b4eaadfbe124dc0226d18df2.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/hf4dn6411ncsi36f3n33cg5p5v/43103518259.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/butil.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/shaqlodf60vnfh6271fmsulaq0/tebosaporafovemabi.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ae5cd9cc7c5c945a008588272e197de6/12767051804.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/99797208803.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kirafupetozasiduxazepu.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/126331137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=can+you+extend+a+tv+aerial+cablePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10748 bytes
SHA-256: 9621d9c9ef3d25904fea1fcf4d5be123fc1f2cbd9080b445d8fbf4540f6fa955
font_01_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 17008 bytes
SHA-256: 6014204aee40568cd83ef65c6bb23480d511503812f82e8061c585d26fcbb353