Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b70f66cbff6f94…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 04:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc42e3d34d8c0eabdd0ddbacb869d1b4 SHA-1: 1e4f3d166cf5f747ed07caee221b92e0d6451dd5 SHA-256: 59b70f66cbff6f94d59e4e0f70d97c411a279334d86632914447122b98e75a09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, characteristic of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure suggest an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://levne-pohary.cz/UserFiles/File/63558515083.pdf In PDF document text
    • https://nobelboya.com/userfiles/file/lekak.pdfIn PDF document text
    • http://zzquansu.cn/d/files/jomexuburuduk.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/8325023773.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/88858432739.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/rulivenefawogov.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4687682e58fd583dcd63b1182db058c6/kidimofu.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/8539381605.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/34818840902.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/ginizukopisudufodawomuve.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210904071730.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/08a249d7994e76e7c578ef39195482be/wutubezuwotobupexe.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/kemabefojunofeka.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/zaloruxurikanimef.pdfIn PDF document text
    • https://activepymes.com/pub/file/laroxidusozezole.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/kozodowez.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f476d7c55---jebike.pdfIn PDF document text
    • http://gazetavk.ru/img/file/47532334667.pdfIn PDF document text
    • http://www.polni.si/Images/files/97641368311.pdfIn PDF document text
    • https://vientangluc.com/upload/files/63715709952.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae40483266---25438052989.pdfIn PDF document text
    • https://combrooncom.com/contents/files/mekanugowek.pdfIn PDF document text
    • http://katachizu.com/img/news/files/68967655396.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/32461247064.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/pomil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pet+hotel+my+hotel+for+cute+animals+mod+apkPDF 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_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 18068 bytes
SHA-256: 1922e6023e2a07dc600dda8d3019ff031e7b490bfa3ab0e572baae1154ec54b2
font_01_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 11192 bytes
SHA-256: 1db0711758c5eda422e777256c0ee01a8e111158c45bfc86434e91ce81edf434

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