Malicious PDF — malware analysis report

Static analysis result for SHA-256 869a8ba23e9684ca…

MALICIOUS

PDF

106.4 KB Created: 2021-07-07 19:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8b063dcd6eb828fdb8b522a03e4bc5d SHA-1: 00fc6dc97b3c8272486aedc2df7fc2a8c68d67f7 SHA-256: 869a8ba23e9684ca3f3ac7623c318984fe31c4446fcdafd7676728d1b066dd15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=equation+of+a+plane+through+a+point+and+parallel+to+a+plane
    • http://gancza.pl/userfiles/file/kafunurasegib.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/de82400d7ef02fc286a4997c3c88c535/46577589538.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1d4eef81b424b70d016b4788b8bfc3d5/noxalawowerejak.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32f59701cc---58502498292.pdf
    • http://bukhatirhomes.com/userfiles/file/kajerajus.pdf
    • http://gld-lining.com/user_img/files/25306821996.pdf
    • http://uamarkets.com/images/file/sozaburufotamuge.pdf
    • http://zartmobilia.com/userfiles/file/20210609120651.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072feaa0ca63---82154062106.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e558fad44f---rejupukigewewarirufujan.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c787d257fac---natobovuweluk.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/46b079099f1ae17211c8082d542e55eb/wurolovibopa.pdf
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/bojewezotuvex.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607324a2f2826---90534114267.pdf
    • https://banghenails.com/upload/file/18886188673.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/o3b2tkj56bhfkcq2knou6d335f/84820061862.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d0dm3agg6ku56vve9g62nd02kt/32961074796.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1510385b8---xolojaset.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c508a11a719---45878175273.pdf
    • http://austintownfitch1980.com/clients/879833/File/zomudonarize.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4a48ac1ac---55565065291.pdf
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/zozogaselabexebutajisofu.pdf
    • http://nousgarage.com/userfiles/file/mariparoku.pdf
    • https://ajur.rest/uploads/userfiles/file/folapefu.pdf
    • http://altinellerinsaat.net/UserFiles/file/38552567229.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd57d4e87e---21693000555.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/vitopezejaxi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012584.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12584 16084 bytes
font_01_sfnt_off00013ab0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB0 16792 bytes
font_02_sfnt_off000152c2.bin
e035aac688f469c4c17d870ae1627466b13fbd7c8a5417e000339327598798fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152C2 18156 bytes
font_03_sfnt_off000182f3.bin
1c28a42b3332e0e2ab2de0e350f8520b00f9c8614a5bcfdf105b526e437460ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x182F3 10840 bytes

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