Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd74016cbee70fa…

MALICIOUS

PDF

92.4 KB Created: 2021-06-27 10:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08efc2105df48ab89db2027fba9e2c20 SHA-1: 21899d0093b764338f9e9c0f1a861e9d6036db99 SHA-256: 2dd74016cbee70fad2d64025ee56c8d69148aa39c4ecadd1a233c5c3505f573b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of disposable hosting reinforce the nature of this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6dd0580e429b1a347af93d19409e2745/kogilevanorinisofoba.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/dfcdcb51ab686ec45857e99b0b9732a9/jazuliruvopenijexorozajam.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0579118333861cca82a938d574949a77/severedojovupejunun.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf3066653e---20260349824.pdf
    • http://caopump.com/admin/userfiles/file/nemotoxivajuvulur.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a731415039---39582767816.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/09c57a2edcaf5d36a24a2734b729df66/82992913306.pdf
    • https://aartipalette.com/userfiles/file/96112994161.pdf
    • http://hoangduy.vn/vn/files/21830501020.pdf
    • https://hanahana.vn/media/ftp/file/texivilawuz.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9560c998ba---37848540238.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608baf4d3b4a0---341665580.pdf
    • http://diclenakliyat.com/userfiles/file/guwudide.pdf
    • http://angelcabrera.com/FCKfiles/file/deratu.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6d1abc03---84104880268.pdf
    • http://munnarinfo.in/userfiles/file/80859603882.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d37968a8f2c34e9f11d3a110572f3531/lepatejizotususajafadug.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efda0d152f---80684332769.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/ukt9j35too65lcfmiipm8ch8ta/20561279358.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160902fab445c8---78978734131.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4abea5d375b7a010228186bf2a790d83/mupurilav.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/cf0350b18bbe8c6ed6b06af0ccd3a6aa/waganunomipad.pdf
    • https://motelandratecuci.ro/userfiles/file/digukafazudijor.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s7b5ve7g5jm7tliqjdcce9fjpg/1550765621.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c153f8f5d4---repazurazolewupunomage.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/25456410901.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8947ee18cd---baribedimatixurinugu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bharath+institute+of+higher+education+and+research
    • 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_off0000ef85.bin
5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 16120 bytes
font_01_sfnt_off000104d4.bin
b78d1e1c3ba7b87c45dc06360fb7ab16e8092c9b84c3d088ee7e953a38e54094
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 17276 bytes
font_02_sfnt_off00013230.bin
4daa08295d103bf336cc2de4cd63993adbe937d37ad83f08eae828444b97d0c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 10860 bytes
font_03_sfnt_off00014b17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B17 16792 bytes