Malicious PDF — malware analysis report

Static analysis result for SHA-256 f106f34bb491e52b…

MALICIOUS

PDF

90.1 KB Created: 2021-06-28 04:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e74cd94b6dcf3c41e592aaa252b4aaad SHA-1: fd17ed044d19126c3a228d87dc314a4b9ec562ca SHA-256: f106f34bb491e52b6bd622a125394c56d7d2b4f90efa55ecdc2442d5166bbc88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on potentially compromised or disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://volamtuyetthe.com/userfiles/file/49464995242.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/u9n9i1mcho1tumcdhsb8eb7r73/fusilibapuv.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1e6355cb---40862889529.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeb5c561c8---6517875280.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608888c202e9e---50745760005.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b16727221---jiwugagil.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6d5d6d07307c397c248394b1f0ecc040/nugibib.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4994238f0c---ruzajuwa.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5254da124d2749264bf0ca01e2300066/35225326008.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800a1b6d9ba---vunimobomixogamezofi.pdf
    • https://bocion.com/ckfinder/userfiles/files/5841267964.pdf
    • https://aucordechasse.fr/vosImages/mopevubipatazezuburafuno.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e04a43568---tusefobegowajakujorolid.pdf
    • http://riversedgefm.com/files/file/52192017579.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/88826502204.pdf
    • http://sarljarry.fr/userfiles/file/35247224279.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/fe7871483d9a28e0eb93368c7c68a9fa/26436932682.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940f014e089---39344656184.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa93b013903c0f8bb2d5f318fa4f5b80/74468059008.pdf
    • https://eletvital.hu/uploads/files/pesomif.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9ub3fq82ppbi9ve3ji9kuli2r1/goripijokizifofopukawo.pdf
    • https://led7.ru/file/lusovezosupolupogipojero.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=yeast+the+practical+guide+to+beer+fermentation+pdf+download
    • http://s292376414.onlinehome.fr/datas/imgmail/file/11442840261.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_off0000fb4e.bin
a467b6df1ac1a4845685cd8c9b42ee06fa063ef7b4f9bf6443950a537b4c1615
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 17380 bytes
font_01_sfnt_off00012883.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 16792 bytes
font_02_sfnt_off0001409a.bin
9b9d8dd6b44a893cf25ba2d6c86471cbd48504fa490bec3352c0321c04d6f872
pdf-font-stream PDF embedded font (sfnt) at offset 0x1409A 11376 bytes