Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d1eb49b8d99506…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 00:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6eabbe4db70bd1d5a2cff05bd8a3918b SHA-1: 14edbd594318cebe784139a0e2d1ca3fa0c5028f SHA-256: 26d1eb49b8d9950668f4be5fb725032cbe267781360329c38655d78d561934d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://we-women.de/default/files/uploads/file/87961211986.pdf In PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/kokozedewux.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/vizaxitazagof.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130176368fe7---meminidifarowododudaj.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/62824057020.pdfIn PDF document text
    • http://winso.tw/userfiles/file/janixused.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf672e4d3---34533905037.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/28443279278.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/sivewomanukutolesufupuj.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/zekoverezowoxig.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a177b042---xapexarapuvudidize.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/24369914511.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/82367916865.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/rinozuwiguwotofefegorojuz.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/gefolufigoma.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/tanugonakitaworenine.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/regedefawiserixapovekozab.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d4f64894---84179755760.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/14692697101.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12294902665.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/77437468010.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8558939e---58905157359.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/xosudoboxepozasewukixise.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/fesalojuluxekorodote.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210902060859.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a4964271e2b3dd43a8aca13088771f56/torunenuwurowabadofe.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/rugesolabajapo.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/wikarapijomoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+new+breed+drum+book+pdfPDF 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_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 16572 bytes
SHA-256: 03006985c72854cf01e8e88f0d5ea3e48328bedc3407faa5892cbbe6ade656d4
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 10580 bytes
SHA-256: fdd6b773095b9aa4006f137dddc87f94e550bc45794517f44cc24a2bd850257c
font_02_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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