Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f714818bd00ce39…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 15:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c59a2674e14346096379ce1566d8b019 SHA-1: 6b156b3ee079eea589f7e02d3b36a69515747f6e SHA-256: 0f714818bd00ce39a880102db7fd3f9d208371273dc33865c2a607caefe1133f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristics indicate a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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://crewmak.ru/uplcv?utm_term=dual+boot+windows+10+and+ubuntu+uefi PDF link annotation
    • http://domkomplekt34.ru/attachments/file/vopojexovomijoxuxolekepi.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/segofumisadagaduz.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/nugugulemolulida.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7b2c9868---54141900768.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/pogijegojusowa.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/93846146780.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/31040966659.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145a7fc6689f---72264814849.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/53792571642.pdfIn PDF document text
    • https://rafautama.com/uploads/file/20440296119.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/56774096694.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca3286b56---zamalagafasukib.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/29068282863.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/tavezajusavizaluzi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614451fb28c93---xuxiwukawokej.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/sokeno.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/88652244485.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/18912165500.pdfIn PDF document text
    • http://sdds.be/userfiles/file/48655421898.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/88176783367.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/43813487541.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6511bdb41---81025109257.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5kkic9rhavd66m9qjnumndkudv/rawuposevit.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/32450359148.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a766ddbf5---82365763137.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/3646203049.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_off0000bd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0C 17216 bytes
SHA-256: 62fd66d3de235fe7862adb7a2b0a165c3de76cc6d434d96f4300e78891ee12be
font_01_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 10748 bytes
SHA-256: 295ace97b2b7d092d67c978c23a31c1c9ad751d2f767ad8a0a7816f642628f0c
font_02_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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