Malicious PDF — malware analysis report

Static analysis result for SHA-256 660b036e786cf957…

MALICIOUS

PDF

99.6 KB Created: 2021-08-05 07:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e3f70fb6e6d9ed7f50422e07aa3be69 SHA-1: fcd271b33aeb7492513305fdde1bc92ddc2bd181 SHA-256: 660b036e786cf9574e2b20f8d4ac86313e7e35324d549f38116d8ed56a74b29f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://infrive.ru/uplcv?utm_term=el+aceite+de+la+vida+pelicula+completa+en+espa%C3%B1ol+youtube PDF link annotation
    • http://humanitool.ru/userfiles/file/dugumavuz.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/mezujag.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/gunono.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/25177439014.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/fozax.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/veruzamadarokejisin.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/metafura.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e36227739c---xeperakakomamob.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c43037dd2e3a2f8f1dbe3efbfe5617ff/29929188784.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d58453e87fc9c7b87bff28421552f1ee/74888763208.pdfIn PDF document text
    • http://evola.it/userfiles/files/49328323902.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7e70d0d885c9d1b87c8e56124ab18d17/todubimisipanaje.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/88834611410.pdfIn PDF document text
    • http://gtshotel.it/images/file/gepulipobakusubadomo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/90806812445.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/v7kmob2ebn3f7k1n2432e8n4l0/tewuzud.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/kq1hjoo82etkdjv0vlba4l8a93/27294096126.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/zasivoxenojenazenujajox.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/37203458393.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a66660678308efae94a7ab3d8695ba4d/19128176842.pdfIn PDF document text
    • http://fabtur.ru/upload/files/534540090.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/65ca242337e82e45910a484308f54774/mofelitiwiguzuvamalozaxe.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974a6204b0e---vatifokuli.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/49238796987.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_off00011bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 11184 bytes
SHA-256: bead73739b62c80bd05215d4a014b80957c6b1a507131ccafd587f8b117de3b9
font_01_sfnt_off0001358e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358E 18564 bytes
SHA-256: 721acfa4afe82b3bb651aad0aac8be29d165f5da328bbb19f6335b7914f1d7b2
font_02_sfnt_off0001655d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1