Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23888bfeb55fe1d…

MALICIOUS

PDF

82.8 KB Created: 2021-08-31 17:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4236ec4c2cfea75e6deac5481b2b6b05 SHA-1: 70d5536086fbe53769af1021a537a5fbcdc6805e SHA-256: b23888bfeb55fe1d74f7d183097713077c1c02c3aee18dbe213047930bfa0579
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6b70efad5---gavifanomoj.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076687e31928---68236488595.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/54046709670.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/46424623513.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/d6ijsqqperchcpevf1k1b2cqqa/verukotat.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae6874d95---rirajerexike.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba9a52c846---wulutuvidosodidogida.pdfIn PDF document text
    • http://sksound.com/userfiles/file/11013977804.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608457258c832---29658043607.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/61609189100.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/42160306118.pdfIn PDF document text
    • http://checopharma.com/upload/files/47223004408.pdfIn PDF document text
    • http://amdind.com/userfiles/file/69139996031.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4818a3970f---dinilen.pdfIn PDF document text
    • https://t2sc.me/userfiles/tutik.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/db95e109b60a738c3a6a2734520a91d5/tebivugezuribafe.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/3m1ffalth4t68uqkkh54hpv0q6/jodigajefixogidafevaba.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/bobij.pdfIn PDF document text
    • http://leguido.net/files/98755532050.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/jofagebekaf.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160892fa223fb4---nuxanedesuwame.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/54279251942.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/e06a44cadf5d71c14e7caa8e3e97ef43/mozenawinaku.pdfIn PDF document text
    • http://asfalon.com/__files/file/vinabagopemezomavidi.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/p0epc9lf78fhj0th9t6l7lm87t/bufurureveredenusowavi.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/sewabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sn+words+for+grade+1PDF 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_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 17636 bytes
SHA-256: 86f4261cf5d7c36648086d99f8c74bf2d0afd94f9f6e7b3a50fab9425958dc55
font_01_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 10508 bytes
SHA-256: 59bbddc5dad8d7138fdfcec8cf8e596a468e6cf0f642cab6fa7acb23bf2d5b8e
font_02_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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