Malicious PDF — malware analysis report

Static analysis result for SHA-256 23043458c4271ad4…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 22:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af918d716f03d1b9cb939b5cd16b45de SHA-1: c7d0e53b54341a4386f3f3f3ff5efe1a5899fe3c SHA-256: 23043458c4271ad427f8e49e669c6b8634bd95eb1b456d261f811eabeb04d941
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 CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the primary attack vector appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://ksklinika.ru/ckfinder/userfiles/files/25789928991.pdf In PDF document text
    • http://ajivikafinance.com/userfiles/file/11021183823.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff62a0187---lawogetakakagefarew.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/raxoruteragiwitut.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078143d8f98f---kagol.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qn1t4scdqnao8kv5c9l88kbqj0/noxikegimuraf.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/66557958115.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f1ed0396---33800383303.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b047f845e52ecbec0ff5a05cc4f8e36b/47981932691.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20218231843329387.pdfIn PDF document text
    • https://andrejc.si/files/file/mofekutevojakewodex.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/topelojexewapogowabo.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/64268121339.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tiweka.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127f30126fce---96681443503.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca26c768d0---86397884003.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/woxifekebirukufojagafija.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/9b7203f3aab4f0e3763eb72f0ecd4f15/dawiwazibejurodinepi.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/toregiz.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/kizawiles.pdfIn PDF document text
    • http://artospace.com/pics/file/31531632522.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41b0e2ae5---kamugutadumadojidako.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/51421374423.pdfIn PDF document text
    • https://istanajp2.com/contents//files/zuwulu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/pjesd4158l87vda5c67n38v5l3/ginofidika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=software+from+pdf+to+wordPDF 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_off0000c5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A8 17124 bytes
SHA-256: b7d2f2c6432714e356330a7fd71fbf1d7e05fc1b49aa4eb583dfbb9812c1aa1d
font_01_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 10408 bytes
SHA-256: fe956764cb4858bbeee4c394157b1ee506cc8b464493ea61f1619a0f479d59ff
font_02_sfnt_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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