Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e787ae9d3e6dda…

MALICIOUS

PDF

87.9 KB Created: 2021-06-26 00:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c17b3ea3224823df19b9ec7b2a734d82 SHA-1: d40a5d83a17f65786b23cd25afda4d05ed1d3c3e SHA-256: f8e787ae9d3e6dda7ee6ea0eebf9ad0022dc6cce0cfd134c0985bd4e2b498083
156 Risk Score

Malware Insights

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

The PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.colormotion.cz/UserFiles/file/kigelatex.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1cba478c2ec84e2e80cae341fa35ee52/senuvewezikujopitebozes.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/9ef26c15cb1febecfd6338f90cb06611/1176123571.pdf
    • https://communeouchamps.fr/userfiles/file/15138195716.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/38960802296.pdf
    • https://pet-fashion.ro/mm/file/tepeperir.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c483ed6a0c3---16129345159.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/39153167324.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16070812590927---rusojukixuko.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/db421147af8041fcf743ffba50ddd144/sojidegujoritunapelugax.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/73c62a75d032d2c1da151d612f7a553d/vavekizowuralixif.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/aaf63aa4e72b6fae04959d4dd52ebd45/35081709580.pdf
    • http://syuncyoku.jp/upload/file/kerulajesajadirepo.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/37032263770.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a7a2513f---34847467060.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b8bd278d8f4e1521d9c1d5ad58edea1d/90571164403.pdf
    • http://sbstroy53.ru/img/files/bafexakimanigev.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/be4hrhhrmgr466fj2o39aleld4/14018172367.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/52953396652.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/d4dbc480c11eaf71d79b15e84c4189d7/mekowizugupumizati.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a16fc1e73e7---90516862933.pdf
    • https://oteaexpert.fr/cite_imgs/file/radubotosadugofasemelig.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5aed7727296966544915457c9cdb02d7/nevezarav.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=formal+and+semi+formal
    • 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_off0000e8c7.bin
507b781202ab2a7b1290dda71199d588632cb9f1b8584f0f36d3a951750130fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 28860 bytes
font_01_sfnt_off000122ef.bin
0ce534920d2391fb4b8ef836162bcb2e1c6fa940e9b0213a9739919f824768ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 10396 bytes
font_02_sfnt_off00013a55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A55 16792 bytes