Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4f16eb964574a0…

MALICIOUS

PDF

85.3 KB Created: 2021-07-10 09:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3baf8f31d03dfab6813a142f0addfb67 SHA-1: 0c0ce2fae79705a4fea0a822f6575ba110f1a63b SHA-256: fc4f16eb964574a008db4e9f67d58bdb8a9e9d901d828632d5c61002ec7cdc7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which point to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9466c6f63710ad466f8b523e83b0fd16/40617277328.pdf In PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/wulegapadovimenel.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/tular.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/87018307834.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815cf2bd723---wijozizetosapilanuwuw.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/wapevatebu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d96985a99ec0e162fa1e4d83f6cd8c70/fanuwetemaxo.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6f5750b6b7faea6e2bebd04519c13fd7/91389727919.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/8239583640.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ea9a5b09---rilovatigi.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088453200ced---fupitusadileguje.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd33c2e52---pemuwapuladime.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/87135949059.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/lelukipupizobuzoboj.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bcb0c6e7f29706dcad26c9ee3d7bf499/75334575230.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/6234332851.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f4528b2749782ccc8d0ec9acce8c3827/nupololuxuvetevowonaxi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cf302d844---dexukegakidil.pdfIn PDF document text
    • http://erex.hu/upload/file/16517109468.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/lajujezulot.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/gqrbmm7vpvp96f54c4t6d65vkm/74002846169.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2h7h8eq1a20k8ndu8bs1r3oegi/71552074311.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e322a54b---82092321948.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3a33264d---metatoforotukoxunezoxibof.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b6eec341---bonidakadapotiju.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28041339de---37605570442.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/3664972763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=when+to+use+who+and+when+to+use+thatPDF 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_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 10284 bytes
SHA-256: e06fe70244a5703d6bd56996d0948f31a57371eb687dd0d7dacd269de5c385ad
font_02_sfnt_off00011bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 16924 bytes
SHA-256: 380ad1f562f2b1beb3030cde9b32d40a036a14ba88dbcb9b12881dad7ecce16c