Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f3bdeeff4441f2…

MALICIOUS

PDF

102.9 KB Created: 2021-07-07 05:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f491734e5991d4092a91293f266d1dd7 SHA-1: d5b4753af96390f45206c40d25fa930b98893326 SHA-256: 83f3bdeeff4441f2375f8612b51ed84bdd2eaa4919ed66bf1b5e450529aa1216
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, many of which are hosted on WordPress installations using the Formcraft plugin. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://infrive.ru/uplcv?utm_term=ursula+andress+and+elvis+presley PDF link annotation
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081efaaf134c---jafeneguwirefagogon.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/24931069456.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/47785523679.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e882d8f5---detoxarasirimexabedid.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/lizovas.pdfIn PDF document text
    • http://wawa757.com/uploads/files/23303370788.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/699becdda166c5cb1a5e8b94b91c0367/79423183287.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607453ea8e550---wuduninetafisatibor.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/19559720200.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/jefawi.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///62149480340.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d035d01a14a---85829077601.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a560bc01c7f---voferadedudatum.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098493f16d6b---wiwamuv.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160939e9aa4ea2---pavajogebogutik.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fijofodaboba.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/dddc421683047333214681ce51937ec7/47234328909.pdfIn PDF document text
    • https://limmaginebistrot.com/file/jefimelizemetevik.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd088541e---wezuwatadademu.pdfIn PDF document text
    • http://4bx.pl/public/file/8865261900.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/0d3b6c7bb26a48255bf4642469ef2314/majamil.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/27164590366.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a53b7fc8895---20854740388.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070666e202e7---kekagaxufu.pdfIn PDF document text
    • 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_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 20296 bytes
SHA-256: d37dcc915c6be25b82cefb210d581a4de580d808200283b8d7daca439e4aac54
font_01_sfnt_off00015d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001752e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1752E 10452 bytes
SHA-256: 40f33c04209f000fba0e73051f677ce642e1f3ff5ed7f67e1895d8af334f3546

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