Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a2a19f7bd5b911…

MALICIOUS

PDF

94.9 KB Created: 2021-07-07 12:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f4452c9dd5b2039a8de4f8124e240d0 SHA-1: 5fec04561c86bdfe322efe9752d57ad67df68761 SHA-256: 42a2a19f7bd5b91150236c6df406ab03b2b2ed65933f65b5334c35cf549672e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to distribute further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://archism.ru/uplcv?utm_term=percent+of+dwarfism+in+the+world
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/kmoer1u3miepkpnrq5q9dko4li/77752246754.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d023734b1c---91080291569.pdf
    • http://montaze.org/democms/userfiles/file/75540533218.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/749e721471c2d99e5457ed9ce0afd965/jakatu.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/9hki0f0ob4o0mj9ho7883106o6/9047375510.pdf
    • https://zionapostolicministries.org/uploads/file/11100428600.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/suwavowe.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c9873b6cbdde1ac735f7015f8962e3d4/kukov.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1pjjuj2dsbqiudoi0mtgne039u/75111229602.pdf
    • http://chikatere.com/Upload/files/wozevagomugaxunira.pdf
    • https://fnb-concepts.com/images/uploads/files/94609588299.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d72b66d17---41924086496.pdf
    • http://edu-tur.ru/userfiles/file/12006686989.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfaa2332a9---janivuwalonis.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608595e57f708---pujixozozugawi.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7837e30c6fb2b0112a69e532b977bb80/22719169124.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084473b0cb30---30985147304.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/21dac23b1b5f6c52bc863e96dd54f936/torojelarumakimizu.pdf
    • http://scard.vn/app/webroot/uploads/files/nosaximibezosuva.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a18aacb2901---wuxem.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/jixivov.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9e8873e9ef89351e04194b5ce95ddcfe/36755596223.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/53973086037.pdf
    • http://hasdeu.md/data/userfiles/files/34900175653.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wixelufo.pdf
    • 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_off0001102c.bin
f08d35192516928157b6ac250ef11e67003fc64802dfa844e3e60669187b9981
pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 16824 bytes
font_01_sfnt_off00013bef.bin
9d4fd56f57a8164367c0542dfa76251b65b398bc2d66f115bea65fe9d02f108f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEF 10828 bytes
font_02_sfnt_off000154c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x154C7 16792 bytes