Malicious PDF — malware analysis report

Static analysis result for SHA-256 7031a456e4a75bbe…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 09:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c7fc378eb63069a2480e197e8f14849 SHA-1: f882ad62bebb0d1c76d4bac27cebbec5ccc0eed7 SHA-256: 7031a456e4a75bbe031773ebe38fbdf4a36b74bf64ea2fa42cf3e6f3bd540107
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://asacnfservices.com/ckfinder/userfiles/files/93416935386.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b9691e56---13051609822.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161202cf4b0282---24868160448.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16230678719927.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e030c0f2375---gopemelozalon.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/larixeguje.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/sukevabogovunoku.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e44648cbe968d95f2756a399b2c51bd9/90792082781.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/72757181840.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/s0u8rppa2r43urppm0e47ktjrg/13688354933.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/49811595328.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/35d826cd581a7b5b614a37be21fde1d8/jipezevajabenezimegux.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eaa443ad0---2444700417.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/dedeve.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/kajuferuferin.pdfIn PDF document text
    • http://myslizdrave.com/soubory/18870542398.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8112e11bd---zivomepomiborajuvobejek.pdfIn PDF document text
    • https://superchills.com/userfiles/file/dugezuzovejopikokeziv.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/abc30ce1130126c25dced148f8afd7cd/dajovowakuwafimiwinerawox.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/dc500dc03f4567e11770f934f8d6cbb3/17636797293.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ff73e45502d38e935dbf7d9999943510/xexulutedomuzojezir.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fb259431dea272e43a8eab0a5da15dec/45522480826.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130669854a63---warulak.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/9118099786.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607916784ccb4---muvigolodatukeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+gumball+moviePDF 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_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 10356 bytes
SHA-256: 384c0adf93036304521b58c6f5730fa5edc739aac2aa7751638c0d2136e7d185
font_02_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 17912 bytes
SHA-256: f89f141321f534fbcbbae8bcee73d2977bc4eefb0b9b2f10995a2eddf5eed838

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