Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3b125de39007d6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 16:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37f3542de1b284b8bee877d3cb7efec8 SHA-1: dc85eaf144aa6c8b0a773df0823953645ee0c015 SHA-256: ee3b125de39007d60a8249ae2bfe971115bc1492c22721911f79024df6b66ff0
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of JavaScript suggests an attempt to execute code, likely to download and run a second-stage payload, aligning with a phishing lure for a converter tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://apsara.ru/userfiles/file/xuwupojipamugo.pdf In PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5f535655c1215e9faeface1767e21297/godir.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/vudisuxadepojesabepe.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e7744adb6---putuf.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0519266db9---65450041875.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eec9ac603---suruzekizine.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/fa3fc4ac7b8c84ef85693a565d26a11b/giwulepapomajo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/acka4ibppe49h92di9qrc4n740/35390480360.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/51551306250.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/tuwom.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c57edcb8---lugifovovotixu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8b6075030ba76c6306e927f26a45ec23/50397031490.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/23eaa615c843b6d73690e4399653ee9f/poges.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e7db72fe---14264939551.pdfIn PDF document text
    • https://media-get.com/userfiles/files/werekite.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/65064370384.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c457be2d---87246519825.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/ragodojuvumirijen.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/bixofapeponoretuwaxa.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/73859775323.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3eab5640d---6076954534.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/60186759481.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/dotojazisewisunekus.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/tulabagotaxe.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/6394269791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pdf+to+excel+converter+tool+downloadPDF 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_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 10464 bytes
SHA-256: 012e993146928ad058c55031270f39ef870fb4ba62fbea33c7c1df8e644e0277
font_01_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 17580 bytes
SHA-256: eadf075ee6190903e8f01c6a19e6e117ff481babfcba9c31c61d5325205ffb26
font_02_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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