Malicious PDF — malware analysis report

Static analysis result for SHA-256 7216e7e88bd059d2…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 10:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f45810bd8597a20ac7e768fabba72d5 SHA-1: a0a1d5d2c1fea612f41a07d8a9bce5eb50de98cf SHA-256: 7216e7e88bd059d26f6eb48d8b289a26ba1d8d7ea8de37c0c9003bbeb365ba4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=math+worksheets+for+2nd+graders PDF link annotation
    • http://lycee-elm.org/userfiles/file/detitix.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/fa52041913f0349c585b589b9696322e/wajutodisasutekijitesukaf.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/jofibidigalolaxanupidal.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/riwitikefumowow.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/gegisiputo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/073e5c5136565595ae74df174ca112bf/tutusodizodagerutowukem.pdfIn PDF document text
    • http://eva.am/files/670ce388e4e48014.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/matebusekegezazimepovudup.pdfIn PDF document text
    • https://csn-alliance.com/data/files/jinizuliteloru.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/9445476286.pdfIn PDF document text
    • https://menu2uplus.com/images/file/lufodixefedinavasafeja.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ab67b2070---vedetexenasibefuxovure.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/kizagapa.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e225b1c5f3acdae1cc369781ca0b5fc7/86024197893.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5143d465e1---99472192838.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/a75963b2205aeb20b92c61eaf5719e3f/13314119335.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/63292934528.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/84977548844.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/714a3665b5ad32e969335199c94df24f/widig.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/dff63179da77b474be4c678b99493bb3/49752262842.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16106b4714b883---54930842322.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a95c570f5---94612621679.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_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 10784 bytes
SHA-256: e9148a5e02db0c444dd6c07fe4c9197dba2d8e5079a066469f467b51c6a09c13
font_01_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 17852 bytes
SHA-256: e4db88639a6dde72cbb671bd8bb67b3cf612688ce7276d0d9f5facc2e92fba60

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