Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59c36a4deeeafbf…

MALICIOUS

PDF

81.1 KB Created: 2021-06-25 22:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e724ae42419608e7e15b55a5be2b297 SHA-1: ac96ccaa877f965928e152c97b8fb0fefc5ca483 SHA-256: a59c36a4deeeafbf2666b47c25ca30653f345261ae68aa9d7188852bd86745f4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to direct users to malicious sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kfnmdg.com/upfolder/e/files/20210602221127.pdf
    • http://canvangdientu.com/images/file/8269700952.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88bb053a6---28112129703.pdf
    • https://betibg.eu/webroot/img/files/89199081417.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d2edbc571---zedepifaru.pdf
    • http://ferrogep99.hu/static/media/file/11914671555.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607235d429034---48237724183.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a152bc9f064---48281225451.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/7oah4fq0q6s1bnel7h2dm271dv/musovusi.pdf
    • https://vigiweb.cl/dinamicos/files/file/dunonamejig.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/82d0a304ceda3717b72ee416a44b5cd3/fizawibapetuxarakili.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a9651e2d5---90423729451.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f1398k6cv8dt2iatvnqm969rlf/85581762612.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/e5j04o8o322d3voqi7g4egc0un/vigovovaxajajudivip.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ed46a8116ab539e89b24bd325713b58e/kijuma.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/boluruxefide.pdf
    • http://nordicaluminium.ru/userfiles/file/wodobakurisagilavedexotij.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d61808c8---pijepadesuxun.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094debb209d6---dixokeviwagifivat.pdf
    • http://bachova-terapia.sk/images/file/salijuwepi.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf305f942---dawokut.pdf
    • https://partner-support.net/user_data/userfiles/files/48337914865.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd352563de---duvezerumatigarimofaxo.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bf1b2c1a2---58676239295.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=speed+up+pdf+search
    • 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_off0000ddd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 16792 bytes
font_01_sfnt_off0000f5e9.bin
020942eb2dcde2200bd9349417e423d5ced0f9e31a08d0123922a62e4f377953
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 10432 bytes
font_02_sfnt_off00010da3.bin
ba7c6c6e11508cf72192f4d58a24e5ec05d52b7bbc930e6e9e44d341d5a587fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 16168 bytes