Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42812225305c2c9…

MALICIOUS

PDF

90.3 KB Created: 2021-08-09 10:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d4946d3cefcc1e8ae5ac8e74eaa3bdb SHA-1: 18706cc3166e9defe4d9494bbb39b154b60db1e4 SHA-256: f42812225305c2c9e03e6cdb26566377d897174fe04aabdc920779cfc006ea23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, including one hosted on mfplus.ba. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. The presence of numerous links to potentially compromised CMS upload directories indicates an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16110c2d5b6174---37279362009.pdf In PDF document text
    • http://www.asslar.de/downloads/57919134760.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/80506665099.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160833cc30f83a---7986041186.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8ad2a0c9a9409ace73d65c11cb33eab7/faxujuvoxusona.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/70286652754.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4a9b5d74ba68ec136331bc90e5060711/56696952711.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/99248322168.pdfIn PDF document text
    • http://tornado69.com/clients/40643/File/74768860074.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/58a41728083c67b9d22463464b8d561f/xoxokusatisa.pdfIn PDF document text
    • https://somogyplusz.hu/files/pufupafonijafiti.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/s8uhfq9p9fuctuf4no8vqljcp2/49021110787.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/60799248091.pdfIn PDF document text
    • https://beaszemin.com/files/notipid.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742ac40b491---vojubejagibikiwufagonuxuz.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f1df1c238---tivojodogalukeg.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40907dca2c---bonameseliwanavubu.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/tijeteredezaxapajorefi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/68b9af56839e73521d7828fe06fc8558/29089727813.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/12939995513.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a94990017a8747e2fb643f930d4c6a33/xamitotubug.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/lakagapumaraxidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=examples+of+children%27s+strengths+and+needsPDF 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_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 11184 bytes
SHA-256: 6a13045138646b52c724a6ad1ae1517ecf6373694db16beb5ea3bb22fe16d520
font_01_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 16900 bytes
SHA-256: 03a6158c68bd3da9e12430c97227f0ca5b9506d797575d5bd9a23cda15e12f2a
font_02_sfnt_off00014205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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