Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4123fcd1749bde4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 00:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7411651b87b0e03567e52673f8e0be34 SHA-1: 0de08173551ac9c85dca40b77a7d614f2a0d115a SHA-256: d4123fcd1749bde48c1927ca8ac6e04ad227077ab0e526167e56053cddd5e33b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://laborke.ru/uplcv?utm_term=windows+10+download+for+pc+free+full+version+32+bit PDF link annotation
    • http://escuelasfutbol8.com/docs/files/putexarazotejuzapemavogex.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/022016133999.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/48822118060.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/lajom.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210914_040A5FBBA84D9DFC.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-14/20210914083644902385.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijivetijoderor.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/86562358943.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/72700590940.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/77365664404.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/fidudanoserigiletoxebuxef.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/92816233091.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/77224660906.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/subami.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/wasawatazokaboxeguxakodat.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/84094743565.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d555dc44---50326683639.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425f7dea5ce---loxikosigotogozunez.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/7990362850.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/jitefowozaw.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091119191373499.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_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 11464 bytes
SHA-256: 437771401952f8712bf609c5977d31a32694cfbe2b90293bd356a3730601bba5
font_02_sfnt_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 17540 bytes
SHA-256: 1e6d76d87bd4a109583989dcf3cbc2279c7bd91e225d7fa5bf5c9e3ecac29d91