Malicious PDF — malware analysis report

Static analysis result for SHA-256 9162fab01fbf39c9…

MALICIOUS

PDF

93.5 KB Created: 2021-09-08 13:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7edebd72467c010b79b320c0ac875be SHA-1: 199787bb465cb38ebc5ab2311b667ebb99fcfcf3 SHA-256: 9162fab01fbf39c9f14bd990ccad77335e179ed9c403a2708ec34733bc28d4fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that redirect to various websites. Several of these URLs point to compromised WordPress upload directories, suggesting an attempt to leverage potentially malicious content hosted on these sites. The primary attack pattern observed is the use of a link farm to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://czytamzezrozumieniem.pl/userfiles/file/kalek.pdf In PDF document text
    • https://mobspace.xyz/web/img/podborky/files/14208947047.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa57a66da---jopol.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135311abf562---71793003145.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/gujiriveluxuxerata.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/delifopufasus.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/nevixewijolulimel.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/vowikojuvatudaziv.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/vunafiwitimapoliz.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/zenopewir.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/kufabopoxe.pdfIn PDF document text
    • http://holzweiss.at/45376895713.pdfIn PDF document text
    • http://salt17.com/userfiles/files/69244884535.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/bopowefufakesofavujol.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613784e7496d3---86657041115.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/7187067726.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/14810177483.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202195147288337.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/luxewoxemez.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/12719706143.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/biditogenubulojere.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/gekinodoze.pdfIn PDF document text
    • https://wonkingchina.com/d/files/xumopuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fitness+anywhere+manuals+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 10920 bytes
SHA-256: fb3646fa2660770290c906ee6684cf680e4107dfb1ef0bb135e7346537a9a83b
font_01_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 18276 bytes
SHA-256: af6ed9f92d2ab4677879c79ef61c96b69526cdc03aeaf29f508b35e49a234a46
font_02_sfnt_off0001220d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1F 17560 bytes
SHA-256: 90c1a74b1a32a2e2ad45518f6c53a2e346d907aed6306a2726b8d118e7014a04

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