Malicious PDF — malware analysis report

Static analysis result for SHA-256 af424b23ede56ab7…

MALICIOUS

PDF

93.3 KB Created: 2021-09-07 19:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61b2de62ea5a5c271f5f108e25292837 SHA-1: 3e9dd2a8c284b1c6b35202a8118675d3ac487fa6 SHA-256: af424b23ede56ab77fca571ba5d53ac34a9f27dac58751afbef5d5978ba503ed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious or phishing content. The presence of link farms on compromised CMS uploads suggests an attempt to obscure the true destination and leverage potentially trusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c49ae416---dosamarosegazeburemavesul.pdf In PDF document text
    • http://lideparts.com/userfiles/file/1624350158.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021073010590073499.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/ridolafoxip.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/52414688807.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1610bfffdc745e---30105892504.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e3dbc6ee9---tatoputuvuzabixobedazad.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/91126215178.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161174ecf4331c---xunusopabisiruzun.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/54469c50229414f7fef87b2d21872141/12517331098.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc8ce6ef64---kuzaxovewejapomemokasax.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/lusid.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/36895100381.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/71f5bdb08e6e36470a7d7cd8f06ee5b1/77234050697.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608317b820a67---vivevuf.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/6d199341cb3513587e2ed672c780ae34/timidavixonivepomiwikixa.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///zixifo.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/10022598890.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/menuzexike.pdfIn PDF document text
    • https://unitjaya.com/contents//files/24202143815.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/ponurixog.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/78265478246.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/pigifonugabipuwak.pdfIn PDF document text
    • http://ranchobg.com/img/file/jufokegisavoboz.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/11682093487.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/livamiwido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=abortus+pdf+pogiPDF 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_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 10452 bytes
SHA-256: 4f50eb9b7cb3cbcbcd4a156f4da65e251f499e2de2a08635505fc73a445dd597
font_02_sfnt_off00013566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 18416 bytes
SHA-256: 9f3ba353f6be39bef9dbf2287ad09ae26d9f01e93aa7884203b4883846d9bdc8

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