Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c4a18b815083ef…

MALICIOUS

PDF

77.5 KB Created: 2021-06-29 00:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0a2dcf6df175b144a6d7ea8e96028de SHA-1: 410b0803c4e87db13c4b31b5fb2ca4b66bf222b2 SHA-256: 33c4a18b815083efbc27a84510dfed877f27bd2f6c66c67b72508f0307479dcd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/734bd248b5e199c300455e48446b7442/vuvaf.pdf
    • http://chokmanee.com/userfiles/file/pubawozeg.pdf
    • http://dmkaudit.sk/101/upload/file/88329563646.pdf
    • https://la-klamm.org/userfiles/file/19620691111.pdf
    • http://ecandrychow.pl/Image/files/vajazunurinisa.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0debd3dd---dulitofudifotujaradit.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/l8n6shh1ssqcpjco3tab78le36/74672088977.pdf
    • http://mistral-paints.cz/userfiles/files/bekagokituru.pdf
    • http://bet-balance.com/userfiles/file/65625522138.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943bbfac2be---76771152578.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089f9149de88---regunolazemusomegizelani.pdf
    • http://cungcapluonech.com/upload/files/88733027679.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/832fae43ae115859626d9218cfc6020c/rogajut.pdf
    • http://kojeneckezbozi.eu/userfiles/file/71225052362.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0rbd0hjpkmvdied042115ktk6c/86197570846.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f360206f617e21f6f94a5b636f7603a2/najideru.pdf
    • http://meskerjager.nl/media/files/rutijonifufoge.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8ce3f9d5---74784472510.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ttpq8prlk8bos60isqh3o46kdd/17198880614.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/76c23b3e8124331a72befec5f45bac05/79817211896.pdf
    • http://dzwigipoznan.pl/userfiles/file/gulomafiwetukezoros.pdf
    • http://gokea.org/upload/editor/files/goruvomuwabukotibesila.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/43740548205.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb27b5ce0d---laxuvoxijorapizukedut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=incubus+wish+you+were+here+guitar+tab
    • 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_off0000ca81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 16792 bytes
font_01_sfnt_off0000e293.bin
fe3b05876178e04d89f7040cd9a0315bcc67b35d10644a99c173e496571ad583
pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 17084 bytes
font_02_sfnt_off00010f35.bin
9cced22c70cabf2770b14bfcc981c381b0a00cad12b866a42782cc02b8e47e65
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 10856 bytes