Malicious PDF — malware analysis report

Static analysis result for SHA-256 3834060c457587d7…

MALICIOUS

PDF

93.2 KB Created: 2021-07-22 17:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 436a6036f19ff933eb6b5ac4644a2ff9 SHA-1: d4a00550d71b729c0ae3ef98676909908277c31f SHA-256: 3834060c457587d764c90f3252844ac137d0adac902508fc6e6ec97ac0278ffd
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/nenexonepewezum.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2898d9875b---61338871009.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/38430022243.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/wokenitipexibodoroze.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/wujavimeve.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/50032386492.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/muzosowa.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf90aaad1---81652575730.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/22165096063.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/linuzanuvuxi.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/nepanedituxadekaj.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5788d7560b---84194873761.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/udm6pi2k4mmqf3005g90k65t85/10399772979.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/94825391126.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/kubepat.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/32854122366.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/ketujepoxodileloxowa.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/34ncu93177v3b162ggfcd4j7u1/xupizakusufuja.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/018b993a74fe957a2dc87c8533e60d0f/rozodagomube.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/93991790962.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/xerid.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/15887de91854c69e043e47fd0a0e8ecc/latulopovegivamidijudal.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j9umri4o4h7imuqob8b3gquqdt/mosizira.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/44885r2vatm35t6a23rc2229ad/35628348031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=commensalism+in+the+tropical+rainforestPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 10776 bytes
SHA-256: 50e010748b168223f437324bf87cb6bff1ba107854d51d5235f39c93b5ea449a
font_01_sfnt_off00011fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD8 17840 bytes
SHA-256: fc64a8abf5f7aba01c48e69de4e0845697b1a67a29926199ab2e559bfa590274
font_02_sfnt_off00014e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1