Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dffe12d5ff5692a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 10:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10edc160df6f0be06854083206c8b6ab SHA-1: ec09a7a57220f38a7475fe388d1764f5f5e66501 SHA-256: 4dffe12d5ff5692a7bedd1683940d80602569d6976a70fb1efd3faafda25db60
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript suggests an attempt to execute malicious code or further redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=the+ancient+secret+of+the+flower+of+life+volume+2+pdf
    • http://dentherapia.hu/files/file/sovujigodajudasukixudakez.pdf
    • http://e2ingenieros.com/ckfinder/userfiles/files/88118245646.pdf
    • https://bcm.es/files/galeria/files/22880744832.pdf
    • http://studioassociatoemc.com/userfiles/files/nizasemeboruve.pdf
    • http://yyfxsw.com/upload/files/42578008558.pdf
    • https://asiquim.com/ckfinder/userfiles/files/89393010731.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/db434bee637cd24b53fc82301409db18/kojol.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/35522774741.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed248c698---99795196980.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613079f6a6a13---kefotuwapekuzub.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79c329b6f---xupewomebegoju.pdf
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/75719878188.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/11630234526.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zixogusudu.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/11e538721e3120bc984fabcb25813043/kefapabepubasovaxadow.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9dcef47e---93176808073.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba42aef266---zofal.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ba13f8097d48a55b0c7b8e50e65240f3/bekisawinowagavaxeroraw.pdf
    • https://trompis-tondschungel.de/userfiles/file/walofak.pdf
    • http://ez-surveying.com/htdocs/cljr/data/files/40520897789.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161401a2ec5aee---tizoge.pdf
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/81214196901.pdf
    • http://andreevka.topmebli.com/content/xuploadimages/file/ramudu.pdf
    • http://biondiairsystem.it/userfiles/files/85253156932.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_off0000e35f.bin
bcfa9c3dab44f23fb7f803e5f11af7ae55b7d31fc28fed391527f4a0c026d9bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 11220 bytes
font_01_sfnt_off0000fd93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 16792 bytes
font_02_sfnt_off000115a5.bin
d8a2d7c59e0191ea136fe50ecb16a623501b8b8a7fe6cbe8c975bc3410aa8ce8
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 17360 bytes