Malicious PDF — malware analysis report

Static analysis result for SHA-256 4736ff99998d5533…

MALICIOUS

PDF

85.9 KB Created: 2021-07-04 06:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 915ca1c0f0cb6a374ba196f76b8e2d4e SHA-1: 4c761c7eae219b77fea7d4371dfb62879814d2ca SHA-256: 4736ff99998d5533622f00b91f604ae189e8068080fcba44b26cb3d72765b53c
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially malicious URLs. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=the+golden+stool+book+page+173
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdedee75f---tifipupevolegetidozuzude.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/88537010906.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b335b5745a2---96623993426.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9cb327b30---39648025562.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf322c2bc8---70087700854.pdf
    • http://chretkinia.pl/userfiles/file/futujerama.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c44ea7be---19909402538.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771c43bd1e2---19762498954.pdf
    • https://aplusadvance.com/naver_editor/data/file/janonurulogini.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf8d5917a---15897256347.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5b0be168---wufedajogixavibezegukofub.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e164676cb---17584694887.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4af38b496d9ec1428c7e86d572d8c615/wasoxivi.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/1dc4ccf21b5fed6ea798e9761f7eb351/jilezimusokodasubarefoga.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/gnogifids6vmtvjl00ndb072u7/nibubolunijiwux.pdf
    • http://www.szphotar.com/admin/img/files/xunuwitomedobipikujol.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/df7df47857acddef678344a362757205/64651230091.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7anjpiq9td36ckrdgav0afjht1/37029888741.pdf
    • http://seyrimerdin.com/userfiles/file/tigafaraxilupusilijimu.pdf
    • https://trimix.bg/UserFiles/File/wixorimiwoda.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/6l0mlgbm2i8egna7aqgoh72bt5/21076744280.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c03e340f---4225982825.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3c7nueo9pbkdt13pmraejb2r8o/rabebuninosanilexexipemu.pdf
    • http://ahkjt.com/upfile/file/rawesofivetu.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/9ab46da8848088fb5b7a01fc32b2eca8/9833420372.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1d.bin
77a137106e8842f4d9c37b21d442438acc59d80cf45c8f9300d65af0fb317f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 17616 bytes
font_01_sfnt_off0001195d.bin
915a23ef177b7bd958d3879676c402ebc7e11e86f8218903856e88f6cb3d717d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 10948 bytes
font_02_sfnt_off00013266.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13266 16792 bytes

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