Malicious PDF — malware analysis report

Static analysis result for SHA-256 895d87fcff092779…

MALICIOUS

PDF

92.9 KB Created: 2021-06-26 00:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec4fcef60b6fe54fab4b6a79fe5203b3 SHA-1: 4a944a01a642e821ee95992860b09d672b731963 SHA-256: 895d87fcff092779f2768a6d1a599c6250b8252b9ef9f97b1fd10fca0f379574
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable or compromised hosting reinforces the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://saokienviet.com/uploads/image/files/judojarov.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b5c51a91---xidiwezolu.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/198d0e23fa254a26a82fd1a11d342b22/92057850952.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/zuvunuzax.pdf
    • http://vantaibactrungnam.vn/upload/files/zugelitod.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a53ce097ec---kawapidufezulikati.pdf
    • http://brainbond.ro/userfiles/file/50779284440.pdf
    • http://nutronicltd.com/userfiles/file/tujunoja.pdf
    • https://rybczewice.pl/userfiles/file/16614409951.pdf
    • http://botosani.ro/img/uploads/file/wunapigobozifeligatanipen.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160980d35b6fde---52017089258.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b564eb353b---wovatutuloguxuwozilaki.pdf
    • http://studiolegalezullo.eu/userfiles/files/womamutakufomosuke.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf5f107ce---51973878142.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a92cafc7180c6f9809d8e7f2ee2a1ab2/rilapibidodibibakowop.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1731cd93b6---wavufotuwiw.pdf
    • http://fouladsazanco.com/Upload/file/lorufotoweriwakavebapora.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6640dc96a7---fekubu.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f43e584619---1212742454.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/bojebivavaxusilavinadu.pdf
    • https://contactfm.be/userfiles/files/5632653561.pdf
    • https://adtw1.com/ckfinder/userfiles/files/wovipurivilojalowulevepan.pdf
    • http://apvn.info/userfiles/file/buxejebola.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/59e16754c77a8c8b77ffca214a31dfda/43268069765.pdf
    • http://biolabsrl.org/userfiles/files/wufoxigolegukajoni.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+the+suspicious+housekeeper
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 16792 bytes
font_01_sfnt_off00010c7c.bin
15f3bf2ecae804b723d481b60d9838e50920bc10d3446937eb416b09f400adfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 18332 bytes
font_02_sfnt_off00013c3d.bin
8dbd595c3753139663db66ee4a12e3b77f8b87d364f94ae10a7491d65d7c3ae0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3D 10888 bytes
font_03_sfnt_off00015560.bin
6b7d07b6529b012854bda486777f8a0658732afd9cf97000ac888db80142a419
pdf-font-stream PDF embedded font (sfnt) at offset 0x15560 3660 bytes