Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8ebd29f728a942…

MALICIOUS

PDF

96.9 KB Created: 2021-07-03 01:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e61d274689062ffa3f342dd694f8fed SHA-1: e6e6865ca19106a9b695e0d68865af78bf9bd2e9 SHA-256: 6e8ebd29f728a9425c05cbb25f77fe6b9e3bcf9a4aff63f19294e2f814dd2f37
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to SEO manipulation or directing users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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=3+biggest+cities+in+germany
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/toradudowatavugetufave.pdf
    • https://m3csrl.com/file/35591246217.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c660a4441---40200199396.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/xeranovigixagaze.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/mibupubofibidoju.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/t23c1lj5ekiud0msgej539n0if/rarajag.pdf
    • http://www.almansori-ye.com/almansorifiles/files/51328632727.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/4449d4efd238d1cc0f90cdd43339408f/10514817765.pdf
    • http://midel.me/userfiles/file/nesenafojitujuretevilu.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b1f61df6273143b4c832e32c831412e7/86728276902.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609288eb9f906---55109503073.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1366b579a5---degut.pdf
    • http://al-farh-iq.com/upload/userfiles/file/golufarig.pdf
    • http://crackershrimp.com/file_media/file_image/file/66429851591.pdf
    • https://michelbarbot.com/upload/files/16075853978.pdf
    • http://tourister.kr/userfiles/file/guxekogodovezetitukuxub.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/1gsgf9ott5l7pbm0svihvfv681/ladekixizidaroge.pdf
    • http://france-ex.com/images/blog//file/nugajupukovexo.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ed27c7fe---nejov.pdf
    • https://nibrasimansch.com/userfiles/files/devibata.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778673dd199---wosesugajomewobofujud.pdf
    • http://studiodrago.eu/userfiles/files/bejabipedep.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d9383131aee73f7a01a3c7694df3226b/79124629047.pdf
    • https://somogyplusz.hu/files/xiresaxuxadedinevakeravi.pdf
    • http://aaaexpressheating.com/userfiles/file/budaxuratijatef.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_off000118ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 16792 bytes
font_01_sfnt_off000130c4.bin
5eb346bc7595b0592cccfab77fc35113db6bf2f76d3d3b392a14a44a0c2013ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 10736 bytes
font_02_sfnt_off00014978.bin
b0c51088c606201ab19b7722833677398c598d593ed72cb6994953ab1b46f3c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14978 17360 bytes