Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f0d5ca97b22125…

MALICIOUS

PDF

87.8 KB Created: 2021-08-04 22:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 741a07b8005203ad5dab462dc0f466ca SHA-1: 9537bf1a94e5559ff60f0c994be61dffdb2016c2 SHA-256: a2f0d5ca97b22125e130b63d4c32e62cfd97558e3d722e06dcbdbc9dfcae632f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=which+is+the+best+whatsapp+mod+apk PDF link annotation
    • http://enjoybowlramenandpoke.com/uploads/files/57291442135.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32d6ebd18---kepenirel.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d40ba72ac54---befagujiso.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wonazavevenanazi.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/6309230055.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5e632593ae82906d782a40f59ef90eb6/morufivesodidexe.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/365a75538e63a3e6c069a230fc9d5ff8/56378813999.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/72665249198.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/tutafekuperopokazu.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/43525336486.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/dusikur.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/nodubajujolamud.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9798af86f---95878674709.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/zinamejizowunigajutaj.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/45920308378.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/59281063731.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/38998820962.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08387b1218---4570056005.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3ecba4165---muwuxol.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/vivumugufajuvalibudido.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c9015839---61463114497.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/78803a6fa574707e04415a092258eae9/19942273290.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5226d1df---30698822413.pdfIn PDF document text
    • 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_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 17296 bytes
SHA-256: 36cef98742e8a591486e9426f2f8521938c76867d91556c16324df58d12ba784
font_01_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 10840 bytes
SHA-256: d09af8a6e67fe3f643bfdd5ef5022675b4ec43bd94ae802340320bc049a23b03
font_02_sfnt_off000137e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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