Malicious PDF — malware analysis report

Static analysis result for SHA-256 599cf0a4c25e5a53…

MALICIOUS

PDF

123.5 KB Created: 2021-06-29 17:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e951d1b0d26509473c600cb5d27e0fed SHA-1: 357305aad900125f64b5d12b34a33a425e810f25 SHA-256: 599cf0a4c25e5a53f6d915a56200d69b5ac804f06e63fc5a3fa7f2c439166a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://synerhu.ru/uplcv?utm_term=use+less+facts PDF link annotation
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/eis40k7le6taojlimue42e69s1/buwipurizegexuladipolej.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/betozotoponafuw.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ssbf47j9nk6e5gvj65hoa1mp7u/98765699864.pdfIn PDF document text
    • http://uamarkets.com/images/file/kiremexe.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/pavexavulemiju.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162325133373.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9f2c48243715c21b8a2d23bbd2d0dd7d/tojatepisapibor.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ab3f230186f7e0401b26f02158a70d5e/36929171251.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/mgbkeddhhkd3rbtf8pnql50156/nupenolabekuxosoziv.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hc9v80hlgnflh4rl8b1st7k863/vezuxanixiz.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/49645759109.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a73f9e14e526670e3d79e099ad004545/90604700733.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e0bc4401---53228708219.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/6282pjl2768jo4blrligal9014/31861089106.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6874326c094efc666a3209477c29e4f4/36457933909.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/473b2b644f287663b7d85639bdfc7f15/weribudikopa.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2cda198795288d8c9931a343534d5a60/13496918986.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e42b1d30c.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/433psp4rcg77ki463u058d783n/5941266361.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/badilibuzujipunivawoxinu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8369aca3c3024af42e944ba1003ec72d/50633209917.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0c4c532d5604775be60889bee00e06d3/kesolakiz.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/25810572683999c22f598bffdf9a7358/36393212704.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e12c0fb60---xavutikemi.pdfIn PDF document text
    • http://rsst77.ru/upload/files/nimojufurazisovu.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_off000183f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C0B 9920 bytes
SHA-256: 6da917f36408531ff64b837a37fbc91aa9879bd85f2b333f39f89066fbf456d3
font_02_sfnt_off0001b21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B21E 17904 bytes
SHA-256: 81b1278f0a017a1726b9d1bdd9ac7a4ce6d1477a10580dffe81d6f2e729a70e3