Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e42f27a13f27ce1…

MALICIOUS

PDF

79.3 KB Created: 2021-06-26 01:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 877aae63c157618e28831c0a21838e06 SHA-1: 6b9cac9e743042fad24561e28577631635d361d0 SHA-256: 8e42f27a13f27ce11d9d74da76357f7bedf84fb55e5ee80066be3b5edb6cdb34
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to manipulate search results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://paperland.bg/uploads/file/lelukunosodixegeb.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160980a29007c8---futigapavanudoju.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/kebuzamitanid.pdf
    • http://banghetretunhien.com/media/ftp/file/gorunuvetumaba.pdf
    • http://ajtoablakcentrum.com/_user/file/90189180772.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/df5c5bf93a9411f4def2500bd5bf38c1/sovukarobilimaxaladiz.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/tuzotanu.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d936f2a8ff159d733eb22b6eebbc6730/jujoxuviwiwofajoko.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607222db603e0---14541648562.pdf
    • https://a2designbg.com/userfiles/file/71862678618.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8e27c952007f8e70083758cf087c3cd2/jezetibivukuwek.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc841c1be---62857844025.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098c046cccc9---75988795176.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6a01eb5351a9075d7a1635fd37953caf/madepi.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609079f1f0c44---powepisabasofatujupikefu.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e3c2299a---64441950111.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960462002db---fezovam.pdf
    • https://ahha.az/userfiles/file/74941733465.pdf
    • http://ximangsongthao.com/app/webroot/uploads/files/31590777315.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a52ea342bdf---1620435046.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/mapadumajedovalerozunika.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/857d15e2f587351e883fa717f1bc00b6/97273639420.pdf
    • http://evohome.pl/userfiles/file/mokojirililijajuxinen.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd77acbea---viroxemefirobaxowijakawa.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aac438d38c2---35061668601.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/15cdafcaf8f347f840506d14872ec803/63190776313.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ea5415pj6sv0kgkinlg66c8hj5/ruwokeni.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=thomas+the+tank+engine+table+and+train+set
    • 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_off0000cefc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 16792 bytes
font_01_sfnt_off0000e713.bin
b83447f7dd9b081f492966623b06cebeef8659fc198473260bff711d6d4abb9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 10892 bytes
font_02_sfnt_off0000ffd9.bin
4abe8765b0afd7f341d133a6808c5da78164719c52cddb9c3c04798a198579e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 17464 bytes

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