Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6455fc0a388bc6…

MALICIOUS

PDF

70.4 KB Created: 2021-06-30 17:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdf48b4771c696e5225abc023956aa4a SHA-1: 410b849d8d0d8e2dc1f4ca42fe265d55b3cb27d6 SHA-256: 9b6455fc0a388bc6d39c427822880ae2f37c086b72699d6fc025e790eb4e3989
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ivaco.it/file/1761630989.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/18674195840.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3593340db6---47272094545.pdf
    • https://canionglobal.com/FCKeditor/file/mobatej.pdf
    • http://hainescentreasia.com/images/file/bevune.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ohnuds7lskjrufn5k086qnag29/kowogimok.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c0044973ea4---nudabubagobitotin.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0140b0d43---37353041812.pdf
    • http://foto-klub.dk/userfiles/file/zudefaluwubemuwavet.pdf
    • http://rts-3.ru/upload/files/54850355262.pdf
    • http://arcomproltd.com/userfiles/file/19118609797.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/04a00e92ddd1db625278da8b96a4d130/sirigilutapijusolulumo.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/gurora.pdf
    • https://stopserv.ru/files/file/bupukubawajam.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844864ba50---95348304508.pdf
    • http://www.serenissimaservizi.com//files/tonefe.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ccb564fda---87860982093.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43dd31cbe3---ninuval.pdf
    • https://adsbudget.net/userfiles/file/vufonajaz.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf66d0c16a---2245127661.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/5dq03g7s173244af33bf3j5nd8rn50p4/barokevibijumov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+baby+nurse+is+called
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b50d.bin
889ad3a78cbfd40c882e329b02d448420f554a9f9e38624e33a7a20ddd823a92
pdf-font-stream PDF embedded font (sfnt) at offset 0xB50D 15472 bytes
font_01_sfnt_off0000dcdc.bin
7ad9775900c7651137421eb5206337dc95e813f0b9a6efbf2a76d369a79ef73a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 10480 bytes
font_02_sfnt_off0000f4d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 16792 bytes