Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8f82ee4044af46…

MALICIOUS

PDF

87.1 KB Created: 2021-09-05 19:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b2c88c316a787b2c17fd746beb5fbb6 SHA-1: 4d67540bbfc2bc466c8717cee467d22b769b9c2f SHA-256: bc8f82ee4044af46ea5d96b8d547d250fcdc350a649f312b3f0de20b529dcb1b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised WordPress upload directories and disposable hosting domains, suggesting it is designed to redirect users to malicious sites. The presence of multiple links and the use of compromised infrastructure indicate a likely phishing or malware distribution campaign.

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 https://chcial.ru/uplcv?utm_term=wa+dol+practice+test+40+questions+pdf PDF link annotation
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/k026iv8t2r9bhlu4vuapt2f3f1/7157434919.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/dudinizukatobipowikelav.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/vubepotozunikozilurabifa.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/bepiwisiwiluxatadixunufu.pdfIn PDF document text
    • https://ebooksweb.net/files/file/52531329568.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a821d644ee9---57609278726.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c0895054d50---10937248349.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b40a307b8---wuvopozudari.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/811891105a6e6a388de2952271d3b890/1889917646.pdfIn PDF document text
    • http://matras-devison.com/upload/file/nuroxevokoj.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6eba3e44c2c274da923319817fc2146f/tekeri.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/geteloninewupepalira.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/81990224694.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7b6dbee4---vilonedizijasusoso.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/20493270552.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d6658f6d8---nixakatogufimarasezev.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/kirasuxefiwisuvunobop.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vr39llej27o33t8b3h2483t03h/vexitokegerutajitelazux.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a29a029b66c339eb3411fea7dcc3e08c/nipamobamogoviwumotisur.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/mupalatuko.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/80660606790.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3412ae9956---4825638091.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/vatefusigif.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_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 11052 bytes
SHA-256: f56b8e33bfbd8ab5bc14ec352f7ec209b9c76d112795569bb3a240fc05b56e3a
font_02_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 18332 bytes
SHA-256: dfc1cbd5563ee2ac734ae9c93a5c926e07fb93264947b64515dadba010824bb4