Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f37d23f386f494…

MALICIOUS

PDF

90.0 KB Created: 2021-07-30 20:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56485267466095af7b53554c1332dc5d SHA-1: 7b8ba2aeff61e1a38a03a150d4a58606f68a7e19 SHA-256: 23f37d23f386f494a55e17ec060502bfded95f9ba7f6536a2d30cba19bfd4b95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting. The URLs are optimized with search terms, suggesting an attempt to lure users through search engines for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links indicates a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=latest+telugu+movies+torrent+download+free+hd+dvd+-+torrentpk PDF link annotation
    • http://tropo-design.com/ckfinder/userfiles/files/77410987522.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091906e50c0d---24236328420.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/dacafa5b838ccac4ac5c43caf00c9c50/jerowid.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/15418210719.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/scg6gml0igqtl2hpc6prduonk2/76669828096.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/76158412481.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721dbd0d6ce---64415531501.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8255721ba---21682345726.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b53dd67f22851ac0a06a160eb6433566/25364610614.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf3add466e---tuxipozibikagovevo.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/51737359447.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/sekafujibugigi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51751af83---paperikem.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76546121713.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2b697511c---guzesonaxubategagivufasu.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210627_4857D6585A6EB973.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0c84fe136defd9e3d0c178ad03661e38/jowamatavur.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/bodaporalinujer.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/17522035830.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/dazubavawexuxuxaji.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/19366fa8e48b85f128ffc0a26280d02f/8293461465.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/92462589854.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/2766677687.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c494ee35a72e1f197e02ad4f84d4d3ca/42815070418.pdfIn PDF document text
    • https://andhimazhai.com/images/files/19074466627.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_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 11280 bytes
SHA-256: f1551c7645848e5a74891ba099bcf1147e548bbc0b025ef33a6fdb667dd586a7
font_01_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 17432 bytes
SHA-256: c09d938c639fd3b70251b55ddd68479aa8b74f39d2fee7a8b80f3b854fbfe3b9
font_02_sfnt_off000140d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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