Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bda61459de0f663…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 20:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74a53bf12c12183ee3710e119d6fafee SHA-1: 69cd80461cf580f228eeae87f451bad706ad3045 SHA-256: 8bda61459de0f66302ef2168b6017fd4d1d5c9769500636f545a1764186dc748
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=assassin%27s+creed+unity+android PDF link annotation
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/6291970266.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/e74v2bdlqjhajm2vpfgt2c50k8/92341984930.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/3214025330.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210911110245_bfl6vc.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/42524399340.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70b25b4a4---sofofofapopinobirasigopi.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/wiwomukuti.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/08c12781745ca947775daaabc42001a0/87900057534.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/damup.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630670404.pdfIn PDF document text
    • http://chongros.com/userData/board/file/76128548590.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/32789205637.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140916716a08---82504409237.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9ee273686c8005e959b5f693a98118d9/55849304235.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/pumusaxuzoneterufuruj.pdfIn PDF document text
    • https://businesslife.com/content/files/ramomidowe.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/riwufijopakapituwozivij.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/28325613477.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/kofemipiguva.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/lufigudid.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/58425373591.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/84476249013.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/dipivekizijulepagani.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/vototatetaxejowoduzuposat.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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 19180 bytes
SHA-256: b7172ccd76749da1c8401c34fe18a89897c92dfb47e8a4cffe2b7509d3278511
font_02_sfnt_off00013555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13555 10548 bytes
SHA-256: ea571de6a3e585459c6d810039d5203bcae38b8b3da48b4e71fc90251faa37ec