Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e46de4948fb5b61…

MALICIOUS

PDF

70.9 KB Created: 2021-09-16 21:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8150ab103ebb3185d848143c3e622bbb SHA-1: e68be6412960fef9d8a87591ae3e47a9fed32437 SHA-256: 7e46de4948fb5b611721396d20eef3e6fdecc8d17cedd102a616fe1845b568d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=ethane+sigma+and+pi+bonds
    • http://poongdung.com/FileData/ckfinder/files/20210903_332CA4C3DA779C97.pdf
    • http://4reality.cz/userfiles/files/gemutikimivirav.pdf
    • http://goldenteriyaki.com/uploads/files/tafomaki.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebc07cd31---55937348179.pdf
    • http://studioaba.net/userfiles/files/81811180984.pdf
    • http://gdgom.com/upload/file/210912044708916971ti24g27lh0l7.pdf
    • http://munnartourism.com/uploads/file/wapodosazinalofuroxuv.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4162a7cd5a638de03674bd1482849b20/fotajo.pdf
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/57791443711.pdf
    • http://thailaundry.com/imgUpload/files/rulajebedofijozesoj.pdf
    • http://becucci.it/userfiles/files/fitenitamuduj.pdf
    • http://ccsilver.kr/files/fckeditor/file/173530930761375843a1ff4.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc07515fc---38017167307.pdf
    • http://streathamtaxi.com/survey/userfiles/files/36793425588.pdf
    • http://hk-sai.com/ckfinder/userfiles/files/37758555765.pdf
    • http://chuabenhxuongkhop24h.com/images/files/zipagafolabi.pdf
    • http://krcatikyonetimi.com/userfiles/file/jaxazososepugasipab.pdf
    • https://wangwangcamp.com/uploads/files/202109010150084665.pdf
    • https://pima-alarms.net/slicice/file/87255580324.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389efef6cd---vodebap.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/gorirarikemodutibad.pdf
    • http://caythuocnam.org/images/files/sasupimim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b50f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB50F 16792 bytes
font_01_sfnt_off0000cd26.bin
e9360809da22c76890c3c5ee69b60e8e662502ac07aaee30824a721b23836c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD26 10816 bytes
font_02_sfnt_off0000e561.bin
6e07d8743b3415e8db6fc3ca09f9dfee1fe7ba4e596e9f1cf74ab51a35d3af4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 16244 bytes

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