Malicious PDF — malware analysis report

Static analysis result for SHA-256 860cc2818b4c7992…

MALICIOUS

PDF

83.6 KB Created: 2021-07-01 22:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94da6924d8e3e8ee6b9d0a516d1729c5 SHA-1: 208c5e01d604bf823c9c1281a29a7d440c637451 SHA-256: 860cc2818b4c7992de724b7002e469227a6ac038bf91dab7d55b3aa3934b1398
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised WordPress upload sites and disposable hosting, likely to facilitate the download of further malicious content. The presence of a 'download button' heuristic reinforces the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=n64+game+roms+for+android
    • https://carlojans.com/cms/file/78300938807.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906af0115ff---59787214095.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabda63b01---bawodaxiropisadirizo.pdf
    • https://hosvagyok.hu/userfiles/file/21106418840.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc3c1218cbfb8594aa56a91f3d2b3ce3/pagapajajifav.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e56017672b47e63c1b5c02613b4773b3/kinuzopevavufo.pdf
    • http://sbs-group.co/userfiles/files/75672608419.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a02bd31f5a5---30185496496.pdf
    • http://abwingssuffolk2.com/uploads/files/10130655251.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462b5adde1---80596588103.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/84626fd765878014e88f5114bd439d9f/kajunomoxoj.pdf
    • http://hookmyweddingup.net/clients/73542/File/23982838911.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ed175d64---fakimugixo.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/76226777815.pdf
    • http://amsasecretariat.fr/userfiles/file/73819571955.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbc285237---tufuxazanoxoxomi.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3orokjm48jav13vvuh787ln092/nutinokogemuwojipiga.pdf
    • http://grgct.com/ckfinder/userfiles/files/juberakozeguwomisupar.pdf
    • https://ecotranslation.ca/upload/editor/file/zatizurew.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/p830a6rn316pa0445jq2f8oc1l/25959005804.pdf
    • http://allprintusa.com/admin/images/file/xovowetexubeba.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d8e64b06c---99513071700.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f26a792a37---78267457808.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160786de08515f---5490803521.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/13515441375.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/mipawipipiwi.pdf
    • 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_off0000e3e2.bin
f8399560428887f56afb76231fb58895d105fc99beeb1309f8bb2733a762202f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 17080 bytes
font_01_sfnt_off00011073.bin
ac8c3f9816c341f19d57eeaed2702461cdcbdbd62fe85f10ee94b31789e05555
pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 10776 bytes
font_02_sfnt_off0001291f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 16792 bytes