Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6ba72e47b19e33…

MALICIOUS

PDF

84.6 KB Created: 2021-07-30 11:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68808f65494ed3b79ebe74c37382cc9f SHA-1: 72a00bbbbe286f504c28dfbc51f4e97019639b25 SHA-256: dc6ba72e47b19e33544ba7b71f5428db50b15dfc83eb66de260e7a1713f62d85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7904

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://cructi.ru/uplcv?utm_term=graphing+linear+equations+worksheet+pdf+answer+key PDF link annotation
    • http://kstarsmall.net/userfiles/file///75367164110.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abea9e73c21---86447062014.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/65810367898.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/satatanuleroroko.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/dinafamusisitimeginem.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/nojurix.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3c493ee7---54976508678.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/722e33add899cdb12041a61b4b38e321/gokowoziza.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939fc83b72e---1473605609.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/67262017919.pdfIn PDF document text
    • http://ocean-ex.com/images/blog//file/wirobik.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7e4acbd4f51e16c7d29dcbba250623ab/33713402854.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/40742605493.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae89b116229---kuzomokefezumasine.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/zusuzupitivoxuwu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b38e4e98c22---pujebositebenevosajux.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/92241067525.pdfIn PDF document text
    • http://ahchala.com/img/file/34516801495.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/wigitilafunado.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ofvpdrp2679p4oq6hnd6qjee03/39965643393.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/zerukadodunilixuzirigew.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16074147f4c296---roxawetuzalufu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1sm08rvgca0op045ouf68cmt64/morababedixogezelakibaka.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/90382377273.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/63539114065.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/davopajisejevelekusaduwa.pdfIn 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_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 11356 bytes
SHA-256: 3a9d5051d3d45fa14cdfce97acb525fe3ea5f0ea044407056f894c0d46c20838
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 16884 bytes
SHA-256: 9a9ec63307863c2523d9e55fcd6e50253aa9436cd7381949edf89142f8371742

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