Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7118a0dbdf7e3f…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 08:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6574c22dbbf3a160d0c90df26e8ce0a SHA-1: 298af57d52c9c6299515b7dcba37042207716a42 SHA-256: 9c7118a0dbdf7e3f15abf9308c10b1bba462ccb4a37f1e61e686ad86731d5403
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm pointing to disposable hosting or compromised CMS uploads. The presence of JavaScript and the link farm structure suggest an attempt to trick users into downloading malware, likely disguised as legitimate software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=diablo+2+download+android PDF link annotation
    • https://okinawa4d.com/contents/files/69404600347.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/63454248670.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/deguragel.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/fodawebejisaxuxifojafejo.pdfIn PDF document text
    • http://jfe.hk/userfiles/2054023834.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/67189944510.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/70808937956.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/todopefe.pdfIn PDF document text
    • http://schubert-hh.de/image/file/80948676156.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c1ccd9990a4f81ef8b2d9ef5953c2ea5/36761002713.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143f73bb7d3c---wukoziputolopazibofakop.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/45451176823.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/74466257610.pdfIn PDF document text
    • http://datcat.vn/2018/file/gobadixuloto.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141de0e701dd---relewadebedomovevomotowok.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/38344507891.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/sukofusiwotuxawe.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/bajotopagubupewobumixu.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/45850100070.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/radigigugujozinuwujewod.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/sibolusamoninidimulejo.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/zanifopuwovijukizopolir.pdfIn PDF document text
    • https://agros.net/uploads/file/3691273909.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_off0000afea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEA 14480 bytes
SHA-256: 740ad19dd00548d8ee465462dbb86159f857c7230a67399b7aae944ff07f7251
font_01_sfnt_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 10188 bytes
SHA-256: ed0323628c022ec18b8cf78d11f94c4f1c83a22387a6a2c7c3f88e4f6cf21de7
font_02_sfnt_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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