Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6f95651d84e28a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 02:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 526433687027290effc512b27fc2d1b1 SHA-1: 6ab1a5782638a54c896a57f73ada42a2d16585b7 SHA-256: db6f95651d84e28ace80c7248cb920a4d16f8331f67af00d064ebc0af0ee1c05
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=arm+%26+hammer+baking+soda+medicinal+uses+pdf PDF link annotation
    • https://elmawadah.com/userfiles/file/suwezugekamogugizo.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/xuzufaritafewaxamomageken.pdfIn PDF document text
    • https://elemonbg.com/Files/File/bedusumisezok.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/16116329659.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d828955ad---11531574729.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/renewi.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/206158898661159625d6866.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a939f358cfba3dd202d3aa27bdf7c6a9/78977476005.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1ceb06b8bb111dbbc39a7037fc7a1e48/kotuzaroriteba.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/92226762016.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/67874596402.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/nomajejizosozepakijul.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/rurapa.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e390cde40b4---bewavun.pdfIn PDF document text
    • http://carszana.com/image/upload/File/71387114789.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/32664618439.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/79a2a97a3bb185e182a072ba9981f1c2/71038083236.pdfIn PDF document text
    • http://halaljones.com/uploads/files/zipofiwufilenorinedugureb.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/76355338015.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/ucul8ugl7bn415vflcj5m2vmfj/82471414379.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/27ea689fb129688dc5fec90f8f3310bf/48433043065.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/66340770972.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b407b46143c---33468378158.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/154a12f1e3d459f35c9ed9e6cb5d3bfa/kosoze.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a3dd9c150c29291145653a468646ea61/wojanopemibakapi.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_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 9324 bytes
SHA-256: 751f9ef382fd7cfef937bb1512134d71af690ce465a3f6acbe6f7808231b3a34
font_01_sfnt_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 17404 bytes
SHA-256: 091390934dde6021c70941e9dbd5b6d85da3793d52f6224df66d30f79cbdf118

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