Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce84df99a737726…

MALICIOUS

PDF

83.6 KB Created: 2021-08-21 12:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dbcf7802a2390661b9e67699520402d9 SHA-1: 0fb79ceba0908743d411b2b38d76d374671b482b SHA-256: 2ce84df99a737726afc7acb0ce1e95835758837bf4a8dc9f8c5667c3c769a5e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=how+to+rehab+knee+mcl+injury PDF link annotation
    • https://burlingame.com/wysiwygfiles/file/58725347381.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/wirabakabiguzevulepafa.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/eeb3e62034fe170192887354e6bc4477/2185758766.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/68486142973.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210626_193323.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b2568bb61546c32de6e6aca287f744ca/14462116232.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/pomizeg.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb7e6486e---xatekifapumigola.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/vodofawuwuz.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0abb544ac0bf8a714acea9699166d6b3/lajisarajasa.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/zikutomoruk.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/rinozexo.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ede05a5f4daab3d8261038468e0a659c/revuluxiruvorokedom.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/vorosimilajulafufepomal.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/gudeb.pdfIn PDF document text
    • https://seikico.net/img-tym/files/fipemiwujufogunozu.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/61845775596.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6baf50f253---pufizowesuvoxujodufajepes.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a418ac9f---rijiminasigiri.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/disubiwopakute.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160de2ecbaeea2---27267126811.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/31d13d0349d3b78736c11295479e8a2f/6636569719.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/damegaloganiwalube.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/mezolu.pdfIn PDF document text
    • 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_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 10980 bytes
SHA-256: 6796d1b227df51ecbfe05540b804f18ba6c6420add56d478c05b34cce6a7ddc1
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 16308 bytes
SHA-256: 6eedd576d2827e79423ede5fd3793d28243aa8a3c4e4675d32020269fd85da6a