Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fd0dc41ad24842…

MALICIOUS

PDF

93.8 KB Created: 2021-07-02 15:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5376dcef0b91c4ede77f1140ac2c89e8 SHA-1: 60fdf4a0dd5b0c186d0a3df1a609859525890adf SHA-256: a7fd0dc41ad2484257b15ca02ccac258ee6e306dca87db474900588b209cbfd7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous URLs that point to compromised WordPress upload directories and disposable hosting sites. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9810

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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af97f244365---vawobofufesatetu.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9585ce6884fc4c30a31c46cd66fba532/dadobunokakunazeseruxuw.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dcd8073de---fusuresudetovox.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/55984000695.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/sexizitalisomit.pdf
    • http://ekolojikweb.net/upld/userfiles/file/10841468087.pdf
    • http://tunglamgarden.com/images/fck/file/kireza.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/92dada15258cde154ff0877bfa4739bf/xumuwumebibebabubefi.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/34f996dd15b07998ca8311da58abcb04/munirarasuxaweruwowiki.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/31536408954.pdf
    • http://www.bufolari.com/public/immagini/file/50703831103.pdf
    • http://zkojicin.cz/userfiles/file/88113546456.pdf
    • http://montaze.org/democms/userfiles/file/favogu.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba71e7d11aa---birokusupikufituxajeriw.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c84b5eb985148df0b6a78abdc72feec0/49739888130.pdf
    • https://secolink.sk/userfiles/file/7744372421.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc03ed679b8---pagejurekikelepufezijuzek.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/xuxinegurokuwutov.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609876b7deb70---buketaxadidalininosapajot.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e2833062d1dbe18b589dc8a291bfab4b/xakalixu.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d6c2e9e0---goluworebanorewir.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56ea0a398---bemijixowepini.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89919ddec---54118950146.pdf
    • https://alakharia.com/public_html/userfiles/file/96335968814.pdf
    • https://chmelo.hu/sites/default/files/file/watodopajubijek.pdf
    • http://feriaalainversa.com/uploaded/files/lexobixoduridunazoruzibe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pro+java+clustering+and+scalability
    • 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_off000109e0.bin
3637cfc852c93c94bdf7c0dde70d2072e2e09eb15c2b889a7cf53fdcc35aaa3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 17524 bytes
font_01_sfnt_off000137df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 16792 bytes
font_02_sfnt_off00014ff6.bin
c238ac2cd524cd3a8f773e9eada2dbad59a380fb1c1c84d1b1a62cbaa363a2da
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF6 11096 bytes