Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b5fd1c53d04f6d…

MALICIOUS

PDF

117.0 KB Created: 2021-09-07 01:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11e43f0b8079a97e7fc483313cc9c6d8 SHA-1: 4faf710d4eb0b5bb5bbae973900636de4ae149c2 SHA-256: 92b5fd1c53d04f6d5e0995597756f2edc37294cb7207b9aef82e4c52d5f0986b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple external URIs suggests an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=basic+ping+pong+rules+pdf PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e521ae17fe---86982292293.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/vimizemozokeloliwadaxav.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/22106745092.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/34161675067.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/berodijamefizirutoso.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/sikiridobibazeso.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/vusojowoxu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612719e8b2da0---farigoted.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/24019032352.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160710c11ba96b---57721417474.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/28435456393.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e72faea0c---repatamudi.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvaf.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/40656670081.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210726161915.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/85776676140.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lh1djr3tltnsr5pvp0hm3cvke3/fozamojej.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aca214798ee---8076727467.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6dc29d3c30ae93998cd957f2d66c0fa5/10113854879.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/41926106141.pdfIn PDF document text
    • http://atek-ent.com/upload/file/jofeduzazebamisuxizote.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/nodovu.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/37654544243.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/69046993666.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_off00015fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC2 20564 bytes
SHA-256: a399b5eb844c9797b3e692cf504cc2b814d4c4969eefcf9bcf86e96a3a3cdad3
font_01_sfnt_off0001952d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1952D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ad44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD44 10848 bytes
SHA-256: ffbedb0f9ecbc55279da171f58524e137a2081c0659f08e1b55900a76bb49ac2

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