Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cc2a1c5316e6f8…

MALICIOUS

PDF

87.1 KB Created: 2021-09-04 09:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60254753e5dd845a57239f21af619cdf SHA-1: 42a0494ac275c52661246fbaf6eccc470647aa23 SHA-256: 10cc2a1c5316e6f8f6091fa4ed3a7d6b6e0eb60f006fc9447ab6ec0ec5968cc7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of external links and the ML detection indicate a high likelihood of malicious intent, possibly to redirect users to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=maths+ncert+solutions+class+9+chapter+13+pdf PDF link annotation
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/43fc4db61d494f9e39c21542c25821f0/pujenulotilusewasoti.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4oslumen69hvu7f41buu9islgg/28410734376.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/51859842986.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mbo0pdjffqt43jkonl5eeqg4mf/xamuravamumorosip.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/33054754654.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j9b5t3ipv51cd4qkt9qvnp65s5/tugokavawuvurus.pdfIn PDF document text
    • http://ceroki.com/image/files/28933949215.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/46563789121.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082c58ee62fc---rositugima.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/26803311791.pdfIn PDF document text
    • http://westmont1970.com/clients/1/1d/1d0046bffbd1a03ca32bb02538d2ceaa/File/ligabewumovedikobato.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/birurafatizor.pdfIn PDF document text
    • http://cmtsport.com/pliki/68077449730.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6tjs0c1ndhc9jp622nctn99v77/mixuko.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be95b1e6948---xosatux.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088795abbbce---57289938679.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b3aa75c3d---40925347043.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/99484770697.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/bunarivemovaduv.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/votitixetufowebujaget.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/notuwipagapoxogaf.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/raxoditemerevobizoga.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cdcdl3nn5q3c64o6b5r0be2eo4/wuvejefotoj.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/bonude.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/10795627358.pdfIn PDF document text
    • http://agrion.org/upload/fichier/sovidojewazibedufej.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_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 11200 bytes
SHA-256: a7faf0b94be477517a99f4b7482759e016926f8fad238273e3d688033d7185a4
font_01_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 18580 bytes
SHA-256: d2a8d533bd2a3b830e5174f8a6155cce21b05c177549d5c54c6cbf0e7c9c7df1
font_02_sfnt_off0001361b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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