Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d783ce0da7059a…

MALICIOUS

PDF

84.7 KB Created: 2021-08-13 22:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adb8b97f7a113ac551587fb1eb42b914 SHA-1: 3ff90a2117597e00e282743dac49c2b565e08df8 SHA-256: 24d783ce0da7059aecc292214223c22786218d9c767acfcd182004ccc00684d7
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests a broad distribution or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+to+make+a+blue+bottle+tree PDF link annotation
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/ebb15e83eebefbdc9d80641681022274/joruxefar.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a6716c1a5509e9916cd32a110bda5bd8/jegov.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c323dc9de85ffa076dbd93526e312818/rizerirezufo.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/diratolomero.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624831062.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/jimijajoto.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/janitumuvubupobenewugola.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfacd6c722---poviduvagijomizidedobume.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/58412323258.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610637d1a9d04---nubudoximovom.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/lokazafakat.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7d34994c---xumoxixalatasuponikame.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/77980077719.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/91197727250.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mipuzadiwirizeje.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffff754342---bijuraxajinamoko.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5b5346630dd77955476583c6d9ea9070/zaguvisozarelipi.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/56248886735.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e029d98ef37116e831508d31994ff345/19133700819.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/nalesu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073156827385---mijekapawogodowanaxuleno.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a6647a9c---83538777120.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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 10316 bytes
SHA-256: ed945d42157551a963a75cf45f2e8605de5fef92519184c7d7b006defde547b1
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 16792 bytes
SHA-256: eb35bd0979f68e41229e3543f01f72b62b22e619e84a9797ee095a87edcef3f7

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