Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d858e097ead9626…

MALICIOUS

PDF

90.1 KB Created: 2021-08-21 21:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f24eb2468ed1647dcef94aa5612e1d9c SHA-1: c5875e38e1f27354628e8f220eaa56d228d46319 SHA-256: 4d858e097ead962684905c01445af1e1a655b4b8721f89a4b6f420e52526c4dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://prociweb.hu/sites/files/file/1023804280.pdf In PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/cc6ceb04659a995bc1ec051bb7356a72/25864750459.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/187c8f136fd66cd0629120828890d471/78599762978.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/zepamog.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff9236752---setonomagugiv.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/33064186698.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3518e2e9d29ee0f2ae53671d6d2b45f2/numidezenutojuvakuw.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/da7d2467837cdd6f7e013980e730dc4b/tuvodugipute.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/49839395052.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/43152210224.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8a6890e77f383ee2bc62b3201fae326f/94099350000.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/pumagiwugezavedatogipof.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/8855028806.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609878a499ce4---vofopajoxago.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/vovimidawajafamosovawisum.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/valodumazuwiresef.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e827fbadb96---nuwufuwagefedi.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/95034978040.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/pafumifor.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/972085196.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/zufaloranuduniwanapatifu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/13b066a6b3fc5d3469783346f9ed14ea/74857261434.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/xagepetowidetiposewage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=detailed+lesson+plan+in+active+and+passive+voice+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 17120 bytes
SHA-256: 85853dda8a909dc07f6d5deba5f092b3de9c6a3786c7c6ace7a7033e7a761a3e
font_01_sfnt_off0001291f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 10580 bytes
SHA-256: df46e38c9f4f303fc5e1bc3b7a76a9f3f45099b00fc6c557df8eb6ea2c4c94e4
font_02_sfnt_off00014168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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