Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a7431396633c66…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 13:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7103be44fe13ca30daa2accca34f2248 SHA-1: 1e3b82bd3fc355801ad857d21317a1de5c393073 SHA-256: 66a7431396633c666db4a1d263d48315b6bf8178ce76a0b22fa118472401182d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c5135fcd23062c05e0f7e7ada6ff5d81/zusitupu.pdf In PDF document text
    • http://phoiinnhiet.com/images/uploads/files/34295798659.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/30329144146.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cef285be8---rodozubesabevokisuvejine.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b42e4f452---vilunopufofez.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/14vd6l9mftjblfban4ulpggbhk/52398735821.pdfIn PDF document text
    • https://arerp.kr/data/file///77805817114.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/81003972462.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jufikobulivosufevasabataf.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ca4c294c7f7a7576386554dfc588e698/19525170632.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/hb6hua1k4pj84e28lmavq31g7j/kajaxerexuge.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/162898453817bef960b7c200e7d806.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c69670467---bediwetoxenobu.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/85360134889.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/c0c48d2f82e943954fa60ec46fd2cf55/luzagukowusezatijisopuv.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a74d13ec0be---76435604517.pdfIn PDF document text
    • https://dineflon.com//files/36951512805.pdfIn PDF document text
    • http://casaalu.com/luutru/files/47021590992.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d63c02a0d9f9cefda55fc6f60f029043/38998331794.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/fugivuxegamo.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/22053144306.pdfIn PDF document text
    • https://best-label.com/upload/files/xumisikezetidipewuketoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=use+of+wh+familyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 17848 bytes
SHA-256: dd493e809f47812bd792dd080cf1cf179276a229b8f864942b454d700b04fb4d
font_01_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 10384 bytes
SHA-256: 66cbebb7c971abd8b2117eac05309fd7863a7b2292ed7fbc6c4c132e371999d6

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