Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d3c2c51b9fd7e1…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 14:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b2391abf576bee2000eb2cae7635ab7 SHA-1: b57e9effde6de0c89c40f4ce88c9df13325c2270 SHA-256: 18d3c2c51b9fd7e14157fd19a7847cf857716fd7a1db602b4130d54167cf99a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farms indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://salespate.com/userfiles/file/nabejaxobufelebupubigo.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6857613e13ceaaa21e6fbe60293ebc7d/35947694243.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/mowifawavo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe9f97433---8192239956.pdfIn PDF document text
    • http://fullx.net/files/gukamidixuboz.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/tutudojuvo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390afe8d2f5---didamebotaxonewupej.pdfIn PDF document text
    • http://marymo.ru/uploads/files/30061688168.pdfIn PDF document text
    • http://vladekoservis.ru/files/86131541658.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090905365773499.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/mofilipelopumim.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/dedakugavudebevozekuzogux.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/sopil.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/puwumoladosomiwedikaw.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/44667867485.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/35142937455.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/buvotuge.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/famulez.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/tafoxodirubo.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/35496191873.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/49855753027.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/vibutipisilusilufi.pdfIn PDF document text
    • http://arucax.am/user_images/file/bugulivir.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/vuzidi.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/jevusera.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/61699128623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gta+5+mod+apk+2020PDF 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_off0000bb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 19156 bytes
SHA-256: f29fdd4ec5ea158d22070f12f83bb422045ee0c73586e806b460f105e572f850
font_02_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10416 bytes
SHA-256: 75365f2f67e0adff33d0af8dcb2e17e897446954acd19282f7d0b39a4dcdd8af

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