Malicious PDF — malware analysis report

Static analysis result for SHA-256 852503c60235a641…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 02:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f5c40ee7aeae8e425ea509f7d21c41e9 SHA-1: f5a2cf1a5f7f38e46369df4171417df2f9be2c42 SHA-256: 852503c60235a641decea4cc49e662eb3111a4eb41d299078b42ac9e2f6c9f98
196 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of a link farm on compromised WordPress uploads suggests an attempt to leverage legitimate-looking infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariosismondi.eu/file/55057821293.pdf In PDF document text
    • https://laser123.com/geektic/files/ritemitobekajo.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/bexibexeva.pdfIn PDF document text
    • http://beauty214.com/uploads//files/202108090717353315.pdfIn PDF document text
    • https://anjingliar.com/contents//files/22729085845.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/bejizepududetezikaguke.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a847957235a---ponogixixideg.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/r6iakb97r0ofl09cbe9l5dmpr8/89428973020.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/8992928770.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/zixomenanosuges.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/4565425206.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/wegiviwokuxigalikapo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e428d08ea---vezozevepitamokowove.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/juburoxizerivokiperi.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/67636692283.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ae856dfe---xarotabufuru.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/14382628382.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/810f00460295ab90f50cc5cd1e2bc6d8/rabamerukadurukef.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210704025313.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/niwavugazavinimiluj.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/bipajatajodare.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/86289692693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dr+john+henrik+clarke+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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 16872 bytes
SHA-256: a558c0f5235884667c31515253dd826a48e53aa219c719c8b12bd9791a79dabb
font_01_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 10672 bytes
SHA-256: 21a75479d25302a92c413647b15018facb1313059664820658f6f8622478d4ce

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