Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab0163e49e8d8a4…

MALICIOUS

PDF

89.3 KB Created: 2021-07-01 22:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1fd023e8e8dd9f3e80b2afd6048ee1cb SHA-1: ec10fa65efd38c043ae31c1b21874f5514445e77 SHA-256: dab0163e49e8d8a4671b52255fbff25904fe4b48273a24f88c2ff37630e9b121
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, particularly those hosted on compromised CMS uploads and disposable hosting, suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/resexumixurijemuxawidobu.pdf In PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/76767764392.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfe1a9b071---tovetej.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e11a40f7d---robitipezazoguwazalibo.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/20457978700.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/fiwudamigubufakozuviwuro.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/61931586617.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b03bdcc87e---38059666641.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc170f719---zaxog.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/37241123106.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/10330080219.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160807429d6b52---5842367317.pdfIn PDF document text
    • http://yilip.net/userData/board/file/52099502667.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/wudaba.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fe5a3edc1---gutofimuririrarubolali.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/578b0c90085d9af62ea8ddf46d4e13f2/40125132077.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609acac282d4e---guwozuzezedavizimedipurur.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be15fcde102---82324371352.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c979ab7a8dc---lotidisisuremogagepuzame.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ssp95e3u0stlit266vca1jdug6/43847855631.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a36b986524cf4687894b9bc0b21e1709/53225288811.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/walonipir.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/53003924750.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf11cbfed---82550871293.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f35f3bd5ee---lejoxevutones.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pdf+of+common+applicationPDF 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_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 10384 bytes
SHA-256: ec5bca74074f9e235e835cd5d77eb6b3344878110ef10cde8457901b3242f8ec
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 17348 bytes
SHA-256: e64b072083e6e89cc0a9500e82a93c6c4582f4b001ed0649c2538a399cd379fc
font_02_sfnt_off00013e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1