Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fbacbcba588897…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 10:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df7a4728be696232f92c4db7ec016225 SHA-1: 2ec00ea7560e9baffb734189732294dfe3637022 SHA-256: e8fbacbcba588897f026bbc29fdc334ffbf0a38525912a1967b4163782be6fe1
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains numerous links pointing to compromised websites, likely serving as a link farm to distribute further malicious content. The presence of a 'download' button lure reinforces the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16116c15e1f415---82078295496.pdf In PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/362a5326b7695dcf2f698ed7d35be3fc/nuted.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/bugewunabewas.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/65247804112.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/0ed2f12333592058f741b454eca11505/51547088310.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/76677054151.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2f956e874c3dce200ca9e36420614189/59542159680.pdfIn PDF document text
    • http://vhktn.at/images/content/files/bunazaji.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210625_65BBED6C33457244.pdfIn PDF document text
    • https://grandmake.com/userfiles/nogarizejaletawopof.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/imocpha3tvp9tlcn2agmpkavon/39272829217.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/vidizevafof.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72c44cf917---sozadepu.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/nutizejokajizu.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/21427789792.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/kijagaziwip.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/76130546527.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ac43799c66201867aef050cc84bb4544/ragomimadanesam.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/9331528797.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/pedunesezerinavukalo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9c665074f---14967954401.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/5800158327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+converter+software+for+freePDF 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_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 16496 bytes
SHA-256: 002d70439b818dc3f1598c2aaa8979c5a28cc1f5025cf9d2accbe1d708b27ccb
font_02_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 10484 bytes
SHA-256: 066735b9407e17294be34b82829b9d61750aa38f4a5ce0bbb6fac20ecb0ea22d

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