Malicious PDF — malware analysis report

Static analysis result for SHA-256 5469ab7911913be2…

MALICIOUS

PDF

79.7 KB Created: 2021-08-29 02:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc86283bf0fce2926284f729347b46f8 SHA-1: 1f8defa9efedce915d6f0bb408c8fa58a32f1c09 SHA-256: 5469ab7911913be23c3ff586f350db3e1c0727c6b4ee5925b9dd1eb1a66162f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these compromised URLs, which are designed to host further malicious content or phishing pages. The presence of numerous links on disposable hosting and compromised CMS upload storage suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=when+was+how+do+i+love+thee+written PDF link annotation
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5b54b80c---71324041973.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160754b2359111---kimowuzamumovubejekupiber.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608430a5a9a5f---xowipotobu.pdfIn PDF document text
    • https://trexanh.net/upload/files/bigalenabaju.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/bixopotimeba.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/j13agdit0mapv27r123jls4ro1/boxesorarosapotorugat.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2vodak4cl64of43tqoneppdvcm/5733140072.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/32135996539.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6582a252---73808522657.pdfIn PDF document text
    • https://suksesunited.com/contents//files/82479193880.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf41a68c9---41237912645.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b844bca827a---monupukelovawik.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5b5292caa---36068323070.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/barizazirimozob.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/tukerito.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/90307459045.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/28aec8fbad0c7cccdb8891abf03cbc3e/41217222630.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/15624025374.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e68371be86---gukewesalav.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d700a5d9a---30716751907.pdfIn PDF document text
    • https://renewone.de/files/8202415625.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/97397056190.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/58673292877.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/madamerurafarukazos.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/xolupeze.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b801f8e5---sokizatev.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b66552d96---28883875056.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_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 10492 bytes
SHA-256: 6d8e3c8cce5b0459cc59f560d011b8f67d06c378bb1b5633b4e294f950395cba
font_01_sfnt_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 17832 bytes
SHA-256: 0e3490a598a75df0fbffedb987a8df42d3c680d447654f17e71a2c7977e7fa26
font_02_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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