Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fe792470d45f68…

MALICIOUS

PDF

85.5 KB Created: 2021-07-08 18:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1519c0eaf26e6155e7b3600d9931b897 SHA-1: c018029dace5926e1bdb385d7e35a087114ec5ba SHA-256: f4fe792470d45f68f6257c454b930f435fc2195ef68cea6f157b8e2d334f14b6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites using the Formcraft plugin. The ML classifier strongly indicated maliciousness, and the link farm pattern suggests an attempt to distribute further malicious content. No scripts were extracted, but the overall structure and URL targets point to a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608396acee2cf---92277080711.pdf In PDF document text
    • http://iphysiology.ru/upload/xujunizaxebupojuvefitafe.pdfIn PDF document text
    • http://brukbet.com/user_images/file/57077701863.pdfIn PDF document text
    • http://guitarenko.fr/img/files/20181164765.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/64880959297.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/surapafawofosofewififal.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16088051119b17---munatolitefidedi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c55f163cee3---kazorugo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905bf4084dc---jowarobalimekulaf.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609101dc90dfa---93370036180.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb082bc257c---44081644238.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/88867714e58580ecef4b236db45d03ba/tejaselijigijisitetugabef.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/movudimafafiponumofan.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b7c44b2b3229bf7647174b2aade5a540/jevebobujobasozakuxatigi.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/vivepiv.pdfIn PDF document text
    • http://come2menorca.com/images/file/4167344855.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa6fce8dc---25137466522.pdfIn PDF document text
    • https://doganagolosa.it/file/55329826725.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b332a78c1---zesolowuxejutapifet.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6720f3b72---lozalizuvakanunategis.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086959ca00be---9926245016.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c7d29f627---21713709584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=another+word+for+winPDF 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_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 18548 bytes
SHA-256: 231200c2fa169086c6c0d34bc07b05c4ab790d97ede25bf6924797d548bc061c
font_01_sfnt_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13298 10140 bytes
SHA-256: 7fb22e9c445c4a44ff13d50876c6e15c0285e6dab32dbf41bacfe1d1bfd78d5e

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