Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bc997e351479eb…

MALICIOUS

PDF

73.2 KB Created: 2021-08-02 16:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5cafb6cb014fda9f4c56f0539fe76a33 SHA-1: 16dd0264bab9abd6e32994a8addff1adbfab42c5 SHA-256: 64bc997e351479eb571c24d559998ea786b00c03806645c1e949cf66fdaf747a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is part of a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://iphysiology.ru/upload/fitakiti.pdf In PDF document text
    • https://maisonforville.be/documents/file/tifuzasasujopaduvisebobak.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0beadbb9ba6763cd5baebc09ea6cdd52/1825676519.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/23856306240.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c509960893a610853cab8efbca46f928/43011947294.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/40387680951.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a0fe395a5---rijuvukega.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5e320d724---vodidopikab.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/lidosikixuwu.pdfIn PDF document text
    • https://chpcentre.com/files/file/tinufikafegaduzexu.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/sojitujitexatodaro.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acae6b70496---75840109357.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/seradubewe.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/28176766809.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/viwusuredaganetag.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/5807728044.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8fba9183b28fa506c2003c6ae2ce0239/mezetezer.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/0bfd2da990d90d98bf8601af5d977d6f/mifojewoba.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/15450990139.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/xopalupogiwovil.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/181478a448c5810e6bb5ec05b168ca41/zivinapaw.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/68678221645.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40f70f33f---14785392619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nike+fleece+sweatpants+size+chartPDF 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_off0000bb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5F 10672 bytes
SHA-256: 6e515e732a881a0f14a103de02fd411d9bf1efefd15173f2766227faf8cb957d
font_01_sfnt_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 16260 bytes
SHA-256: 41745a995eee476b1f4cc6b54530c7683f2de62bc7cedbd69b000e6764ed0442

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