Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6136a899ef650c…

MALICIOUS

PDF

158.2 KB Created: 2021-07-25 02:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea7806b9a0d5d47aff35c6014d2b0bd3 SHA-1: a94eb08d17fb89e58c4a18283aabd325ff55d893 SHA-256: 4c6136a899ef650c91ade1d2ee9b22710ea2c9c896bbcf72ff37a6655b39417a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9478

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://thediamangroup.com/_images/files/xijipagifodinexadinu.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rp0u6s4d477uiju49lqk95ueo6/dexakatotakitoge.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/664832623.pdfIn PDF document text
    • http://momsystem.ru/public/file/widekuwelewigipivikob.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1a262489---48696662392.pdfIn PDF document text
    • http://iwaandccareunion.com/clients/57137/File/jifogig.pdfIn PDF document text
    • http://altinay-law.com/images/file/zakegewomipozinadelewewop.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a881f651a21---joxonaduzipewilapex.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16209506047817.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/nafazonudunajitefo.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2634871e08b13cdc5a6e84348322f40e/92900513998.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f4b5bf87b6053d883848766469910d40/nakuzilidagajusefereporo.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/1951029447.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/nuvosifizuwufiji.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/luzen.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/kowokolexugej.pdfIn PDF document text
    • http://peak-experience-japan.com/68321932323.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/93276376382.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/mipeme.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/83282023784.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rihkri7d1jo8lt7envuruuak1c/jovevuzutizen.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/tipomudirujakezujepes.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/tibus.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8a55e1bfc---54931058671.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7e17ed0d44f663f562e182dce78047e4/47796270167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bajo+la+misma+estrella+libro+resumen+brevePDF link annotation
    • 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_off000203db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BED 19852 bytes
SHA-256: b5addd2e3f5035917fd16fdb3af02756d926b1e36a72ea2e9ca72378bb36e675
font_02_sfnt_off00024ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24EC1 10756 bytes
SHA-256: 9cd4fcae51af9a97b6fa9b70219118c3d50471d0785f043efb924cf1a62bd8a8