Malicious PDF — malware analysis report

Static analysis result for SHA-256 88258999c373f9f7…

MALICIOUS

PDF

91.5 KB Created: 2021-06-29 13:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e16ae8dd826278b6cb35b15098398f69 SHA-1: 752f3c01440bec3237421fc08c59db543262403b SHA-256: 88258999c373f9f70b89d10bb2d18caef90804429a5f1374a5f84662f0b4303b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. 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 external sites, likely for phishing or SEO poisoning.

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 https://shriayurvednagpur.org/public/ckfinder/userfiles/files/8198156758.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b842706cce2---wazabotifopofonavos.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/f7a92e15a39817b22b898345744aa59c/47016467826.pdf
    • http://aucoindeshalles.fr/menu/file/mevukawakelijo.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7c16a361---faludixuroxob.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d2a41009---51331623006.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5e71c76b7eed9dab47ffb47c4136d226/mobematewozavu.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f978f41e50---22315864482.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087055ac29ed---71089857856.pdf
    • http://leebyunghun.kr/new/upload/board/files/jefavazulalegubeloxelubu.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/0bb7c80ae992a6f7e6313a4856933da9/36100054774.pdf
    • https://artbynela.com/uploads/file/jujubenigeviwazuvozokomo.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/26302205944.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lok3rugfahhchr7fe9ikadmjil/62866819227.pdf
    • http://vhktn.at/images/content/files/sipifenunojogokabix.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2a9a161d371535796f1f08fd7cc336ef/nisizilupuzolapotes.pdf
    • http://arcomproltd.com/userfiles/file/16251815625.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982dfe3a116---33299243767.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/44985fe73e6005a8f65373c7cfde931c/sugamuvomujajaxa.pdf
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/rofodopefo.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7c8be7ff5---firadejodebitebesawenajut.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/djlvl12rqecesmm6qdsdgokou0/fekesunusaki.pdf
    • https://afayl.com/userfiles/file/berik.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/85d0c7456c1ecdaab2e0ea0280001c21/gukoro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=unilateral+oedema+causes
    • 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_off00010333.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 16792 bytes
font_01_sfnt_off00011b4a.bin
5284cae3fd1438794d22ab47fa64f2849e6c56abb08bd3758da58ae5a93c9a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 10640 bytes
font_02_sfnt_off0001339a.bin
b855255cbeecf36f7b82cf21bb6f83b503648d5202f7766a55a40b7fb70f3b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 17208 bytes

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