Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b7595a2dd55d44…

MALICIOUS

PDF

73.9 KB Created: 2021-08-09 03:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1daae0eb4b0d7aff7780eb7d221ef0d2 SHA-1: d444a40cadefdf37812cfb531647fd634e690882 SHA-256: f9b7595a2dd55d449007c868df3e0899a28f4d304325148d0efcc6627385eea9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on these compromised sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cc91f7c94787a7303f189ab64cc1c683/98552553943.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fh56h1o50gfgfbrfs2lb5et3g/zorizanod.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/56016441763.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/xanigixafasiwokane.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/95rn15pb22iuujqqqnnb29meh1/jajapixituxu.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c9c0eb86f4f03b52a12251909d5ae7c9/repolekuvu.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/wunuputuwatezim.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/673684b0c4275f817f930ccd755b362b/2479989005.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a361dfe68332c5fbe2ca76f7b6c0ecd8/nasaginasitagod.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/mubenoneraziwudavoziguk.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6pcq2emnu9r19fa5fd7agfg892/levujujikoxixigojideg.pdfIn PDF document text
    • https://oliogalanis.com/file/naxodusuromajesogisibe.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c442db73---litodipuwebozi.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210722234132.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2c937412599395734687c2c593b0f05b/48922730392.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5a475793e38c821e601b079efd05bcf4/6768974154.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/4896521352.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/22559280393.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/45321828294.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/98554756940.pdfIn PDF document text
    • http://renovator.cz/files/file/tatosesuwesepurigof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sexual+magic+tarot+pdfPDF 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_off0000be69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE69 16152 bytes
SHA-256: 2475d0badc3da6e0bb3fd022c01e812135463a1662e9e3463f7df629efb8e533
font_01_sfnt_off0000e865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 10968 bytes
SHA-256: b2cd1db3316ce8df1a43db34d39939500cd07ebee8bba9f3e0d38f96ec062988

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