Malicious PDF — malware analysis report

Static analysis result for SHA-256 985f45ffba0deea1…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 21:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 128b57d68c50a9b612097c595a492802 SHA-1: ec4557301e2f072f3c5d37019f20479ce0a9eead SHA-256: 985f45ffba0deea1b10c1ce8a40ec943079fbe735226ab724a6420192aff65fc
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure points to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://garglob.ru/uplcv?utm_term=how+to+sell+houses+on+gta+online PDF link annotation
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/nukejikikijizov.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f7cj903ls761ufmpkpj4maues/11068176384.pdfIn PDF document text
    • https://digireg.ch/upload/soxexozotezixivixekiz.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/69027784462.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bef81532a05---69283146596.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/bagosu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/71883308724.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/23407199298.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/piner.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bcac14ba45e---5257793773.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ec765edd---42998582781.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b373a0a8fa51966f204f771dc7598fff/degesimipadi.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/25720129782.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b6bc0f9ea---kaxox.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0470c2c91---fojovipezame.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/selosawu.pdfIn PDF document text
    • https://avela.md/userfiles/file/99484389620.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f871d69adfea6c564413e3484f618e04/28925224112.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/c7mnr6u09k9c2ga830f9vuqrq3/fijurukinabuti.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cq6bb9re69rsdvchv0smotrmmp/gowutiridutupuxikonafi.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/winuporomobafisotegijapu.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_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 16764 bytes
SHA-256: c7634040c29878af78c46c0646dcf9a974a1f18d31a2ee48efd1265e5b64c2bb
font_01_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 10464 bytes
SHA-256: 174ec328ada7b18471a28e707e44c2ec4706186f1d3f21935d03b7e521e93002
font_02_sfnt_off00012eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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