Malicious PDF — malware analysis report

Static analysis result for SHA-256 d542ec934310ceb8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 04:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c092367ef1f5188d0bdff99959b9c2ea SHA-1: 66cd92907659eb660bbafb96b554af4555f17f26 SHA-256: d542ec934310ceb864b411fc08dcf4aa30ee3f342703c3c44c4fc9bd99619278
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads, suggesting an attempt to obscure the final destination. The embedded JavaScript likely facilitates the redirection or payload delivery, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161408ed405a26---wijeruweve.pdf In PDF document text
    • https://limadelimon.com/images/file/52168305065.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b77a6e36---13078757627.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/15881057364.pdfIn PDF document text
    • http://halmar.info/userfiles/file/raruz.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/47153246156.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/77915691104.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/xoloreputexowotig.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/86150044165.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/2090354193.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/16008572732.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/bed1eb3724605a1c3cc85c1ab9de251b/3640493802.pdfIn PDF document text
    • http://labradory.pl/file/66830720890.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/dolofabubedoz.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/sogelofefomonep.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/17434273144.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f007988fb5fe294c12142d9c17377a11/nokowusikonenegikajaz.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/tisamapuwuvolenidavu.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/gesiti.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142b91233f67---gewete.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210907185031900534n8agw.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/78362880468.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/3771153738.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16146dd9a81d6d---20162473526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=uno+with+friends+iosPDF 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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 10336 bytes
SHA-256: 9542653ba9866f25e5d2ca42862f9b5ae843ce978b734f2f2df4431049bf1770
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 19796 bytes
SHA-256: 7f1747d0eeeb89a28ec19e0a1dd1c2e76f4d64153689b213e8ac619486b37d8b
font_02_sfnt_off0001217c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1