Malicious PDF — malware analysis report

Static analysis result for SHA-256 9724c0db335c2049…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 05:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9730e05336944c2d8f738578230ff63e SHA-1: a71b6893863187ebc5e1a042753e8d25f557dcf7 SHA-256: 9724c0db335c20493516f3a143add85a2af6554db5edfb47c276a00d8f168cce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://jin-hung.com/userfiles/file/54370456218.pdf In PDF document text
    • http://snbedu.com/uploadfile/file///2021092006333196.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9cf7d1e9---xumifekukajurazapikarene.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d79171eb3---12436117869.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/tezugizurazofuraroniwut.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/fodikun.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/35296276027.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d07c1976---sudewomisuwo.pdfIn PDF document text
    • http://coffee33.ru/archive/file/vojibodefifewan.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/28423371452.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/95af239d26430cbadee545dc4306cbdb/lagirupolav.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/54772614855.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/39490201782.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/9683130511.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/posizimigarixiwilemu.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/rubuvakupolafun.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-05-22-46-16-92.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/lelexaviwidozowimix.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/85794428726.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/32412987732.pdfIn PDF document text
    • https://olterus.net/contents/files/9902568763.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/kovefulijadirod.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/28019011030.pdfIn PDF document text
    • http://araratmebel.ru/img/file/xapuxo.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/62117778648.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/misiwuxarasava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=clone+old+android+phone+to+newPDF 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_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 10436 bytes
SHA-256: 77386bcb352c88c955defc677046cac28317767921c0018d7c3b217e480ed317
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 17620 bytes
SHA-256: f5d95e2512f3ad191fba730e1a4387494ee26d2cef95913099a167f72f590ac1

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