Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd1749818b888d7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 12:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5807dd31cbcdf2b2e1ac955db1dca287 SHA-1: 35a18ab59005bc1ce3ae0626d19eaf6bc7a60d11 SHA-256: 7cd1749818b888d7ffbe0a80e172fc3fb510d20927c63d5a39a82f159e0618e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary function appears to be a link farm, likely intended to manipulate search engine rankings or direct users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5c9647335---67249785589.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jkkplvskmv3vce04rvih0eitu/6731982330.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/94101482392.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/semax.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/xunujaziwejumajimo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5cf318ac678dc5e71e0a87488769b8bc/63764405148.pdfIn PDF document text
    • http://adice-area.com/pictures/files/dinelenajevewofusagokedo.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/31868121518.pdfIn PDF document text
    • https://botroul.be/uploads/vavuzidovasojiripet.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/zobifuge.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ff81f6e85ed---lirizuzomorikelujiwu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739f76377bc---20541944431.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/goponafurirolulara.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/muligedomesabonekogexusag.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/lugekedidumepetasiva.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/depozaneretos.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/db494cb3e26442b9ceadc1c7f056ac5d/88608750846.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb0beb9e41---61172356225.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/budowesorirituviwivevap.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/52733158934.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9ae19dcda9918e09a195775e5c58d63b/vudizof.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/xurotanamogiv.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/86343238242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=manualidades+con+botellas+de+plastico+para+venderPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ba3b612aecb1fe446b045de4ca33afe2/96006854767.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_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 18712 bytes
SHA-256: a6b138112d2ea27ef86d8ea89a28227f4bdf6dd3f6de33445913e4d6d5d486fe
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 10808 bytes
SHA-256: 0beab9d7bbf76f12acb22857467b606f16e14211dbb4ea630a3afc918fc9897c