Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8b35c6ce00f813…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 03:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d2e1c7c133b64777c2ee721b3b0304a SHA-1: c5e83bd1ce221b321c7ec420f79091348bd5d55f SHA-256: 8f8b35c6ce00f813689116b077c387ce9149f91bdfec1d12f72a212f1789dec5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://radmangroup-ye.com/rgfiles/file/waxorazovek.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea55ae6647---5234882114.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01579b7c2---tuwofitibamuku.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e91be00e68---4378694866.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/babb39b8f87afbf42d43bcc5cb6ca6d5/luzusevoxojewujagiju.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/bf17q993qe2o59hmdrrs5ci1c6/99202263717.pdf
    • http://allasclub.com/campannas/file/jizijetibesuzikofumad.pdf
    • http://vbs.pl/dat//file/1029546252.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d40d719d3ae---jubewixawojafejod.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/94c14f24975f7d853cb52dcc34c22d79/38667874313.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e0580f315af0ac7acdd14caad1d5fc73/wusafavadovenogukubosenef.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ac93a049ead8ce0c0dddae0dd0dac31a/94929750084.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a712f5fee5---57070976443.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/811881171.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c478e2263a3---pataka.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b594519c457250ed60cb3c376e8a84d/75657424296.pdf
    • http://goldenpeak.it/userfiles/files/dokupoliralixesiditaputa.pdf
    • http://daoltrading.com/userData/board/file/zuvodekajonama.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608872723e304---xezizobamok.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/76243e777da963c1fd96506796ad4612/turuzenisijolire.pdf
    • https://oversaslogistica.it/file/lexabavapowikejapi.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b626f167875---96067490357.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/argk7ih92vp35r1i16eec47gl4/lamupobe.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb661bb93d3---24330190934.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d5369d7a30883ad6f561813babc577b6/dalid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=doctor+who+and+torchwood
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 16792 bytes
font_01_sfnt_off00010540.bin
fc7db2ef9cfadcc758d35cfc0b18f15ed59361ee76d7a5a3012c365071f28920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 10116 bytes
font_02_sfnt_off00011bcb.bin
a0ce724d45476a3ac794a526f1a1305ac398bc55abe372cb842c839f217ff54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 16980 bytes

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