Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d125e89f46881ad…

MALICIOUS

PDF

75.7 KB Created: 2021-08-19 20:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6df0b25e3e622bd5943c366d2967c7eb SHA-1: e94170afa6dfb8063882c0be4aa11302253e5b8c SHA-256: 6d125e89f46881adb3b18da2b617932a2e25d912e1acd677318fa3461dacb44b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious content. While no scripts were extracted, the overall structure and URL distribution strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrabud.eu/fckpliki/file/wogetaxojepuxulav.pdf In PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2a8b38de43530acadc07d68e9d8d49b3/17383017040.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/70760886035.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/kisopavep.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/75914005638.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/46864490141.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/jpt9l6m3eu0kmrp9t3ohghsbcj/53783230083.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42b25ba31b342a36834c8924ff9b5067/97932422280.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/bojivemotisivazuji.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5472672b6b---tamepanuwub.pdfIn PDF document text
    • https://noddy.nu/images/file/fikofopibajo.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/20991428449.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/18714763277.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210614_263AB5DB92FB36D7.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/zovonebuturezijowexi.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/dilovozazerevodurawo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf89b488878---74100166557.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ab0a91e1---35163123219.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/zobagitebuf.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd82062feb7---86125075413.pdfIn PDF document text
    • http://nktrading.qa/file/files/12800469848.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/devitod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=linear+graphs+worksheet+year+8PDF 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_off0000c491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 10944 bytes
SHA-256: cf22dcd1b24c1a1d962fc6608cb681d69ad656be51a6a1a5494c1e677b0a651e
font_02_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 16608 bytes
SHA-256: 47941f2ba5136604f11e72840cd1da8b831e15f2e49e0ad3dc588b6631f32713

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