Malicious PDF — malware analysis report

Static analysis result for SHA-256 db498ee030a68d8d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 20:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed2eb15b8d3b925fab119d5aa65c2b63 SHA-1: bdf4ee4a39f9789a1d7192e5beb0424880ce2e27 SHA-256: db498ee030a68d8d8c80c5bbbf9a31f7b3947e879295b2f08264f17e0a655515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=adolescent+depression+essay+pdf PDF link annotation
    • https://yellowstonewildlife.com/93403115702.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b74ac9f2---mumupaxuv.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1629529420/files/16185759938.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/21004902798.pdfIn PDF document text
    • http://sportsht.com/userfiles/file/ruvivumufagefi.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/3861373658.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c01e99b66403850308750581a324ff5/madefapudokere.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/20644873044.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/52034646061.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/vapugazosodumanapobik.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608880c33f0ef---nufajurefizapefununalam.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/wetuzelazi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918ab1ac603---zodugomomopu.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/zinuganokudelivumemu.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/80391578862.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/19623096687.pdfIn PDF document text
    • http://schokobrunnen.com/idata/92263127663.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/kumeroxugi.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/pifoxu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e0f158800d8fc430038d09a061d8cfbc/safumumujeburejisajuzos.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xifufomesiguforofebi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8c132ba52---kapimupejusidoxubas.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a589d1c193b---tuvoxep.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/bazobadafajatavepodeba.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/96241479354.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_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 10708 bytes
SHA-256: 04ae1d7887c6909cfc63ac8907fc4c0ae488a7af9dbebc6de5f4102db656dc4a
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 16708 bytes
SHA-256: 4261a497c80086c0bce1aa3aa9f9d0f52fdb5311b6b4e4c7333ad7b9d119061c
font_02_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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