Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1bc1cfca5728a2…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 08:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 1fa9cf3e7cce2593e42d66ad00053cc3 SHA-1: 7d07dbebb598faa11d05bc4e1fd8119745ba2458 SHA-256: 1b1bc1cfca5728a2cb0b4609a43844bf6d31a12540baec5e57e4a0a6c52cb737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007. The primary goal appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=galaxy+s10+touch+sensitivity PDF link annotation
    • http://dxline.eu/userfiles/file/4158227143.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144657e0ed93---samabujigapizuled.pdfIn PDF document text
    • http://lamay.de/userfiles/file/fusuduxom.pdfIn PDF document text
    • http://badgerhillfarm.uk/98829461927.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/roloripugojeni.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e0f0d2eb---nudalavanirovomiluxu.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/64376259282.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/xokiviveluwotu.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/soxigenu.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/sonug.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/luxifula.pdfIn PDF document text
    • http://vhz.cz/user-files/lavaripiropebud.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/82994908101.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/jupopedofubav.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161414472d4744---jesuzedofaruwubuxazimo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161340e674034b---83624013521.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/86787479957.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e2e28ad7---judojivi.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109040901372287.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/8666196575.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613552c8e138b---10199440906.pdfIn PDF document text
    • https://naves.cz/res/file/dagujidokipiduj.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81629585961.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-11/images/files/75560828099.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/60884051584.pdfIn PDF document text
    • https://ocw.tw/uploads/files/88202099483.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_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 19564 bytes
SHA-256: c0ef3f5a8e07bcace77f99244e0de765abb0347b8865f948df0a591ea006442c
font_01_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 10820 bytes
SHA-256: dab7a6e49a0da0df891678f634ef8669610859e5809185af6e51ffb5ace652f2
font_02_sfnt_off00012809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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