Malicious PDF — malware analysis report

Static analysis result for SHA-256 a169ee14a3d542ee…

MALICIOUS

PDF

86.7 KB Created: 2021-07-16 13:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13f2251ab42d0bd833f62845d41ac020 SHA-1: 1737399c29ac276316aba0e0e172e32d95a2354e SHA-256: a169ee14a3d542ee59ec30fde71942ee8769ef8659f8c3dad569a3069d027670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://1959blackshirts.com/clients/866684/File/86176316994.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a206a59361d---84325971003.pdf
    • http://decaiyun.com/upload/file/210628024255433430xthp66vbjbff.pdf
    • https://limsurdua.com/contents//files/wosarubizeme.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba881856f53---gexixukowiremupe.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c64aa6c04e0df9942f25f52e313505c6/genomanodipi.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845b72c25f---gopilekudojevowagovero.pdf
    • https://soudurelausiere.ca/upload/editor/file/xisubunimiwuv.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160814b9dd8112---fogimonigisefarevobewiw.pdf
    • http://keralabiblesociety.com/fck_uploads/file/18107660391.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/abe730c9aad7bd94636aac73faa6af4b/lofupederevutaxepefi.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c07c62f1---kozezamufabivus.pdf
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/zedixogenatuvupoxufunema.pdf
    • https://everestart.com/images/stories/file/vizoxemode.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f893fd079cc12ec0924a5fa45aab7aee/zamajuxikozunuri.pdf
    • http://dui-antidote.com/images/userfiles/file/mukekikuguvu.pdf
    • http://koryosushi.com/uploads/files/jafifenalovabiwon.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/39lj7hb0k2mf38cq3lojftdrrb/84352774169.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/80917e08b1e69230a8d89a3a2e821036/41429377115.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/da36c489665edb5843224982079ce86a/nonodigexinofujozobupex.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/dbb5695f50c7b91e9503b45dd03db350/95523291053.pdf
    • http://kingalbertltd.com/uploadedfiles/file/52416734874.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=law+and+order+svu+season+14+episode+1
    • 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_off0000ef74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 16792 bytes
font_01_sfnt_off00010786.bin
989372495c4c87973cd2c6bb3ca76a26e8f4332ac85ed49104300bb28ea104df
pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 17448 bytes
font_02_sfnt_off000134e5.bin
37d90bebdb0bd873898d9c97c7e5480817d9c2f7f397e758602e6637c78797da
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 10580 bytes