Malicious PDF — malware analysis report

Static analysis result for SHA-256 8417de134df3531c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 09:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8d0b65526f8520b55db91af85f15d52 SHA-1: 683400a5b4c41baaf7568010e74248f9c06bdb72 SHA-256: 8417de134df3531cf77e378c8fa2b30935a1563895a5372653e2d0726418ebf9
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and heuristics identified the PDF as a link farm pointing to compromised and disposable hosting. The embedded URLs suggest an attempt to manipulate search engine results or distribute further malicious content, potentially leading to exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 http://ventilatoryzlin.cz/images/file/68271244153.pdf In PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/lofelexikozexugupaz.pdfIn PDF document text
    • http://idcla.net/upload/files/tutetimemipexigowuwuse.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/gupaviwamivufixas.pdfIn PDF document text
    • http://livestocktool.com/d/files/19054307667.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2a1673a361fc7f6ba8a9bf08f91e9c0a/99697758819.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/jumuvalazigobegol.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbdc3bb4f8---84702970818.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/62536190555.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7fc3d52ca3efb0c922e2def922f2a12a/rinigede.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/viwusexedipibaxuk.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2b32912d4---74943473655.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae210dec722---88276116385.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/8330757466.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16102d93edfd44---11586762297.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/293595aa1c3053f86801a59919ec5615/57912902639.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/30721222414.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/fuzimozedepajekalaxomeb.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bb0fd4d6b73cf0a67ba247e3a281b8e8/bufugajezurixofuxa.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zufovinibuwu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607992969dfe7---lapamisor.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/vebigajafuzukaniboribajox.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb673447867---20276423457.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ffc9c1f56765e2d2391aca6b2a8dbee5/21750119529.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4133103bb53a5a1e2192ca3eee12bf99/kisitep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=florence+nightingale+nursing+theory+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://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_off0000c144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC144 16640 bytes
SHA-256: 84cb625dc56d6754ed3b8a5409bba759d95448f48558016153c9ebfe60caf49a
font_01_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 11092 bytes
SHA-256: 67eb0f312b978fa80651a5c7718330811d013cc686c48a32ccd612d2b1c98f30
font_02_sfnt_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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