Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bfb5840c9d9521…

MALICIOUS

PDF

88.8 KB Created: 2021-08-23 13:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11f8f25285c232c8d15fcabe4fccb5b9 SHA-1: dd923544d833c903d37b17e8f25f3c1ce05504ff SHA-256: f2bfb5840c9d9521d6e9d20efb6ae7cae935c142c4bc767b0ffbccaa3aa7ec35
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=download+911+proxy PDF link annotation
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49093ec8e689679487c18cf24b543d6c/10095956206.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210615_142625.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c03d8ae4533dfc61486ad0d9cd61eeb3/muxuvugi.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75de00cfde---gotifujum.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/lutimagaxalugakebo.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/68243487957.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/66517f444552ff9f972bd0da02a4fae3/23884376724.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/57669420266.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021070805573484.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d9386d74---75177766667.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d387ea052f---27286023125.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501113254139397.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5605fdbb0c---73453721968.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0a2c76c43---28767650155.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/50155968473.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/25102660463.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077de1187c51---fazesuzixax.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/xizun.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/5a34c065fe922e05d06646009f4396ed/newekuzunezes.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/kubafagigajebegabowul.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/302205068852.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/le6oa59h5h2j7nnhpt75i27ufn/sokutivu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16660 bytes
SHA-256: 038a3c3e7cf3dc25ed2dac763ba044e6511e8ade75ea9e46e461a74a8ad97993
font_01_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 22860 bytes
SHA-256: c0828fe7832710b1e69406aee7adfca241d8067b89b805bf8a2e7f411ce1fb9a
font_02_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 10416 bytes
SHA-256: f1b106a4454769697205b9cc66d3dfd54a971c4381ea838b1c566dc0cffabf5a
font_03_sfnt_off00013ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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