Malicious PDF — malware analysis report

Static analysis result for SHA-256 2860f2265860d336…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 11:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ae2fa9d21907604f32b15581961db75 SHA-1: 82f42d82fe8d8014fe6827b1a552c0b3f3d8b447 SHA-256: 2860f2265860d3369bf524ed8f6bdb6c0eec7b967fe3adbd56285ae7848d2abd
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, but the overall structure and heuristic firings indicate an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=mqtt+in+android PDF link annotation
    • http://handinks.com/ckfinder/images_store/files/tukowovujexodokol.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/21595371504.pdfIn PDF document text
    • http://www.moyekolodin.com/files/81107938281.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/68253193175.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hi091hcudl2q1lga21iboihmq3/zulupebojerel.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/47222029480.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/tonijotaduvawenita.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/61933024487.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/tajafoxesopijoti.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/mimosirivuwiva.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/31620630577.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/vurikasonuvosugasavowo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b42b3a0e1cb7b4567d43a3ed510cad0c/siwij.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/45984499464.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/fufogoje.pdfIn PDF document text
    • http://suitianhose.com/uploadfile/files/77886867327.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4cfe23991---86555066843.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a0812a9ad909219a89553f3505df0a62/58595486542.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/nerasud.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/50566447791.pdfIn PDF document text
    • http://levotst.com/uploads/files/ropisilil.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613423b36fadb---zejurazepalunuz.pdfIn PDF document text
    • https://kalafiber.com/webroot/js/ckfinder/userfiles/files/14545987487.pdfIn PDF document text
    • http://e5tbr2.alruaa.com/ckeditor-ckfinder-integration/uploads/files/78743853375.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15C 17896 bytes
SHA-256: c5db8274495da700e42aef2d0e547336c23d28f422d439e5bc0794c3a285e41e
font_01_sfnt_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 10032 bytes
SHA-256: ae5a9c53fd1cf8d03383e67b05b47602a8250466e8df38fd561acee8e0e9f602
font_02_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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