Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf070c7a6a207bcc…

MALICIOUS

PDF

80.8 KB Created: 2021-07-03 03:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b5286f6cf877e00eebe1cf53e55f23df SHA-1: bc80871a03b57d9274b6c61c2dfcb97601c5b108 SHA-256: cf070c7a6a207bcc940162fe0def2f99729cf7e3e15791fd538debd680382839
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or SEO poisoning tactic. The presence of external URIs and a high ML score supports the classification as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992277b23ad---kalakugexud.pdf In PDF document text
    • https://burgas-remonti.com/userfiles/file/61423736463.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/mqgav6bab7f4se4k9blsjg9jec/leparojevifaxomifijo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bae2f78a0e6---bevapunometivabudezuj.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9717bfc3d---3501015492.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/bofibap.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/wodabitonob.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/28109758165.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/15a7fd6162786be447f4461de0370940/sikalotafox.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/j1j3lqn9ceq2hrddnsh1vrbgd1/juripi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f8e0fcd95fa679d8c9f626423c62fda6/puvexitat.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/b55npqc9c7up32h0os8r9orf9t/buxararivedilevemope.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074191ed936f---keriwuduto.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e67811a09bef26a74b8781009390e7ee/23298493406.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e992bb14---34752815066.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390c7bc763---4362615425.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/kibakibevok.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/o719g2shkadu1efq4ftp30acb5/dowizo.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/40744444422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=word+connect+level+171+answersPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b5b95e059780276f36dfe1bc56383fda/73592770074.pdfIn PDF document text
    • 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_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 15960 bytes
SHA-256: 126e333cbff358fe4b9c920f8a6b279f6dd4ca52a2d42c505746c49245bf2a02
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 10516 bytes
SHA-256: ef8ce7c45e4bd447c53fa47f97fa9dfc82f74e993d774787a61cbbcdc5ed1065
font_02_sfnt_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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