Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c2a527c4395d95…

MALICIOUS

PDF

88.1 KB Created: 2021-06-25 17:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 865aef9933144ae7f9fa4e3d07924bde SHA-1: 2ae2e39583b4ea0eef7cfe7c5f39d8f16916d1b7 SHA-256: 12c2a527c4395d95cc061fee52d082496482f2778d4edf3f7e872e7c8fa6d3b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to a site hosting further threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33b162c1e2---dejaludutirojorib.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fd3efff44d17bcb1fb026fb7792a1822/74606384440.pdf
    • http://www.allatpatikapecs.hu/images/file/zupamoruvifi.pdf
    • http://stroisvias.ru/userfiles/file/nusijinebuxige.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/25eakj3116mbe8o2opppgsv692/57462343275.pdf
    • http://jjmcp.jp/userfiles/Image/file/nugib.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b3d71f59ad3e7658353608e104bac70e/tupetutewukajosot.pdf
    • http://rauvuonsach.com/images/uploads/files/vavipuxovunu.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c7758389fd49823fb4073053ffd01c60/wikafonexafak.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/n93tl99skv26hr93qg8kjbg8bs/rabemase.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e6451a637d978017e17f9975b7fcebca/jerojidadedodobekugafodel.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5c4f7c3c300dff544edc4fad0e5fb556/dibajojatu.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6992209b36---zutawad.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/disudedurovarof.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/jatemuvubewoz.pdf
    • http://netinflux.net/userfiles/file/21024044783.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/euioje63ia2k2h0dqhv3nearg5/paloroxetefara.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607306f915f10---45274757015.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160700d4007cda---1462181481.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b0388028---55960408421.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160995e5a3c29f---nilabatizebupowupopisu.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/2e0fb2eb9c8b7f8c71c0b561ddb940b1/46946844890.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607781a150e21---44671016390.pdf
    • http://scheiden-maassluis.nl/uploads//file/kixenokifawa.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/bc3cf8b56eadac5f6b0f1d649583e864/sirokex.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608785e6af7b7---84147420979.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=1+therm+to+mmbtu
    • 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_off0000f523.bin
f547fdd59fafd36cb8a040b6e925c41d35ac65b9e9495dc9a66ba3e7f1622ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 18124 bytes
font_01_sfnt_off00012513.bin
7f6cf27b67752d6f0f80cd57596ab0ebabb6da7f43f888b4e6dba7c6d0688078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 9996 bytes
font_02_sfnt_off00013b46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B46 16792 bytes

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