Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0f107db89a9751…

MALICIOUS

PDF

89.5 KB Created: 2021-09-21 09:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 42df1de1775c060edde2c95faae336a5 SHA-1: 67c87d0af07f8ddd230703e81f6d462aeb91a824 SHA-256: 9f0f107db89a975127f88dfc8d22afd980df43bf3773bbe022241cb472f1c3cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://coretry.ru/uplcv?utm_term=raya+and+the+last+dragon+movies123 PDF link annotation
    • http://ebiocell.com/uploadfile/file///2021091318535938.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d70cd4890acbce82c85f0f97bcea79c0/28523310774.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109200106344194.pdfIn PDF document text
    • https://best-label.com/upload/files/85853698667.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/jazan.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/rajiletiwevikafukozagusef.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906234839.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/25921681501.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/lemologebi.pdfIn PDF document text
    • http://deforma.it/userfiles/files/weniziwijokosudutixotab.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/pavidoseferijalekilakab.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/31428106730.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/bimaw.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/somaveta.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f028dbe79---18247245629.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8e2790b5---24066386708.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/jizodojibudaxiburoni.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/47621285258.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/68803536722.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c654186865c4ca4488c3d64c7fb95caf/fopejorojudupodukuna.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/98432993787.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/93213740133.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/56262287050.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/xabaluvelawodudowomok.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_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 11264 bytes
SHA-256: 7e0bc9ec4ad7d342966c247e7067283c11c828407ab59fa7993e30ed992c9856
font_01_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 19340 bytes
SHA-256: 7180e4e2469f7a3031ae12dc27e335e6f770dafaf5f584523f5aa6c9436d717d