Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc683ca70f9a18f…

MALICIOUS

PDF

106.3 KB Created: 2021-06-23 11:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c6a8d9dc4efa9d86ad74e88df9622d95 SHA-1: deb1fa14a4080205bf41b06d812ac891ac1c9427 SHA-256: efc683ca70f9a18f9688002205a3a093e77dadbb22c2b73989a1feb5c2302213
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious files. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a 'download button' lure reinforces this assessment. Although no scripts were explicitly extracted, the nature of the link farm and the ML detection indicate a high likelihood of malicious intent, possibly involving JavaScript execution or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://anvlaw.com/userfiles/file/temawulukisofedigekafu.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/702d72ec90b608ec9b131195379969dc/gidamaxezaduwu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b5d1e98210af8d6b8e755e3c34cbabce/xituwupuvuve.pdfIn PDF document text
    • http://nature-revive.org/files/file/jadosenuzulufirer.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-12/20210612043335591842.pdfIn PDF document text
    • http://moristas.com/userfiles/files/todimivoxiluw.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/pikudun.pdfIn PDF document text
    • https://dm288.rs/slicice/file/zisekezuxinedobokofaxiw.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/356e1d5adf59f62d4f424545ca1ae8f1/zugibemawef.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075757088c24---zazuzulagawisajapokiwax.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf36c2799d3---lugufatora.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/wevalaluzabid.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/685456f336702a0059723558bac07353/74730859272.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f671e08f3f---rugiwupifewapux.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b78f5b205b074c76d2a9b1c6c3b64583/vewanoresof.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a72157562e0---javewejilegol.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/tejojuderafakilixivebebum.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/267e8e1f716e61d719762a958a677569/98186750469.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/c5319000c6cf13570607101e2c35f358/nebeguwudukoragi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dental+books+free+pdfPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001627c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627C 5236 bytes
SHA-256: 783003457fdcdb99fc1518dddc98192b69231ebbbb8694d4ab72f20989b00eb1
font_01_sfnt_off0001745b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1745B 11784 bytes
SHA-256: f0c21729d2dddca38ae31ff7581268b9f64a3c551df620eaab7742fb6e5e38cc

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