Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85e75595fabcf46…

MALICIOUS

PDF

90.0 KB Created: 2021-07-02 20:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6dbc2bd5dca22c73230e1f0e5e2b71e SHA-1: 17d4e7f3491c0029f4361175eb06198b4bc5aa51 SHA-256: c85e75595fabcf462751177fe27ee273cc29139800e8fe738a0eea6a8754922b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://paoladebenedetti.eu/userfiles/files/bunokalito.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91bcb14c52---basizopufupi.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b90957a0e---tarusodugit.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81ee77982---59689517589.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/jadubi.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607136140e68b---29449881764.pdf
    • https://kodcomputers.ro/2664/uploads/70932614172.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/anp6j1uhpvmp2afp8donn3naik/3271538732.pdf
    • http://esoftland.com/userfiles/file/90055647424.pdf
    • http://studiospazioambiente.it/userfiles/files/welavesukagewuzotutolavo.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6fc4284a---navugumorisafopovo.pdf
    • http://dajuicebarus.com/uploads/files/pufeputuvupejojerajis.pdf
    • http://lltsg.com/uploadfile/file///2021061900113425.pdf
    • http://artin-intranet.com/ckupload/files/degobibajopufapilunum.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/26018633191.pdf
    • http://bestbuyfromindia.com/userfiles/file/9205112415.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ta2rsj1mq42n13d09cq4380jt6/pojamekafesefex.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68448236e7---wojux.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a124e2e471f---xadisafonipuso.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/18151797404.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1cb41b45---5113861528.pdf
    • http://gdbchurch.com/clients/43262/File/26344731491.pdf
    • https://kraftyz.in/ckfinder/userfiles/files/zobimidikalo.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c0777443263---79029133022.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=shadow+priest+pvp+shadowlands
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe2f.bin
c2ad7d1fc751f4a91f26d5e73d153d84c8ea865c0391ddc0519bc12cc061cc28
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 16904 bytes
font_01_sfnt_off00012a18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 16792 bytes
font_02_sfnt_off0001422f.bin
6e944707b9561b09f9adf2e812638aeb4cd2b7761e02a3624bcf6211996f3b6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1422F 10716 bytes