Malicious PDF — malware analysis report

Static analysis result for SHA-256 b668835cac56e9bb…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 18:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf59ddb647567d0eadd485ed86c8d0b9 SHA-1: 2702f7d1a2c38a53de6490a15188bd671d582c1f SHA-256: b668835cac56e9bb5c6390279528ffae0f85dc546b9e0a2b20ac3f900bbc85c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are hosted on disposable domains or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to appear as search results, with one URL specifically mentioning 'harry potter audiobook mp3 download', suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=harry+potter+audiobook+mp3+download PDF link annotation
    • https://hotelite.in/userfiles/file/mexipexevonawuwoxosi.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/gamapofiketukolal.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/32798745739.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/simedazexiximubedud.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/vimuwetenaxupuwudizake.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021911929556789.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341df5b5350---xetixoburizipefilifeweko.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/50338489198.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/89006187132.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/fitirusewet.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f803479f---29159226575.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/10374688167.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/69205628606.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1706879ccb55bb8802cbd9c993bc2cd7/22277028949.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/rufubarupak.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pipisarifuno.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/kajuvugefikirerevef.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/55118140283.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/70344463834.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/nujepofitiwifunir.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/58365859345.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/44529959676.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/47626291576.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/37521841663.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_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 18280 bytes
SHA-256: 712e9f7e4bde38042b384f6b676cbdc6e641c8b8ccf68e3cb9421e3a7b3f4ea7
font_01_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 11080 bytes
SHA-256: 90df32fb46340adfa60673d49d76f1ba6b6c73bc36588f3756f4143d4859765c

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