Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c57f61647b1c99b…

MALICIOUS

PDF

86.1 KB Created: 2021-08-07 11:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c500e576ab0d2f03a0af361db6f77933 SHA-1: 19da680a46ed610873b30f73df7783e910c0c035 SHA-256: 1c57f61647b1c99b47a7b289b915cf17eacfc27483879aba6c7e9173e0fef318
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ClamAV and an ML classifier, containing embedded JavaScript. It functions as a link farm, directing users through multiple compromised WordPress sites and IP addresses, likely to download further malicious content or lead to phishing pages. The presence of embedded JavaScript and external URIs pointing to potentially malicious hosts indicates an attempt to execute code and redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://birnagarcollege.in/userfiles/file/fuzelegasu.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/zetefafuz.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce92107548---lajejedegiwutero.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/64943090935.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079008029172---677855640.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/72122940239.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/436a8fb6753e2770c43fa4ccb770f0f8/4962591007.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/demilojerevu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f0ebac3ec---fifirudi.pdfPDF link annotation
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/84m8rlv1baugqt7ptfdgc6lje1/fufozugidikokipumazug.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/66779267249.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73ceca1fa---80988322214.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/1tjj7t2ttocsndt0lnfi8vcsoa/risalasevu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608190e70b95e---7146924214.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/povuxiwonabojijebojanajed.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b9d08cf22---31893526167.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/91170220884.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/bomamigokare.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788bbfca060---tefotuwefukun.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160706dcb9bbcc---87892299592.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5194e427aa459e398610b1252849755f/fizawovaxalimesaburev.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fc7993f0---sososokirusadoso.pdfIn PDF document text
    • https://iword.de/userfiles/file/29981469832.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946bc73a6b3---87366044213.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/tofigulil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=drpu+barcode+label+maker+software+free+downloadPDF 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://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_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 17836 bytes
SHA-256: cee26af964b445e35d16376e3f299ee21c5fff613c0376a7ca2240ce9c646a2b
font_01_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A6 11108 bytes
SHA-256: 28aa575ebfdef68766d98230a8d7f83133d82894c32b7033d88c1aa4b37e7cc6

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