Malicious PDF — malware analysis report

Static analysis result for SHA-256 579762f04e713646…

MALICIOUS

PDF

87.2 KB Created: 2021-08-11 18:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38d5b408d34a088d3a354917ece205e6 SHA-1: 17a0263c6036e6d48ada0292f4e1c801eafc1ffc SHA-256: 579762f04e7136465e44d7ed949ab7c5ebf6951cc255106a870c981d2ce86ae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=vastarel+mr+35+bula+pdf PDF link annotation
    • https://tdfstore.it/file/bedume.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/80733611982.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8359e419ee---89221555245.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/91083091357.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1f3660c3---ralivamod.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6a4t79rkl6e0pmms78hius33bd/41718767828.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e51772d68ede107e345ee6e3c2738e60/lasibifagefapijase.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/308065be90ce5fc149d00940e71075d3/61169789582.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/230049187443.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/jofuv.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/g9vdg4sn3fd667n1k9kjvh4n47/3176456094.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/29233100091.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/bikoduzasap.pdfIn PDF document text
    • https://baglab.pl/galeria/file/22915323597.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070522ea0f09---33512322122.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/zaduxukanozasipupodiw.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9r5vjdcidhnjoqom1dp5m40nm0/73002987233.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/temutemup.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/uplpm51l7m7m049dp5r36tp121/87675029340.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160980e5f1721a---95507309949.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/86604431615.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607df26678924---64593861291.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/jegixajuvelefokoxivepe.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/basateluzupufipoworew.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/36967351868.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_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 10856 bytes
SHA-256: 7791dfa4ed13a43b8a24784c2bb940c48f57482a0eab12751d208e1395a6b3ac
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 20588 bytes
SHA-256: 65563c8c7f2f4075663e46f84a7b8c8fbb895614880bbf70aeb26029cc723619
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1