Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b05b77b266d0150…

MALICIOUS

PDF

92.5 KB Created: 2021-08-25 19:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0299dda5b6d6710e11de34dd11339cc SHA-1: 750d3bc77ee590c3876d6819613d2c682e5d74ea SHA-256: 4b05b77b266d015011f11d07b7b7a7154fa37605af325a90631f81bea5d3fd31
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to compromised WordPress uploads and other disposable hosting, likely to host or redirect to malicious content. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=abstract+art+and+other+types+of+art PDF link annotation
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107cdb1812d6---76741811601.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160850899307a9---zibumejuliwodirivos.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/65314adbcc8bb26f7d3b5ab26439ee10/belozavuzoju.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/725369350.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/eb886729993fce02c357556e9160c4bb/47767446828.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/9452345014.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/14644742422.pdfIn PDF document text
    • http://planetamama.ru/files/file/sisidinara.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/48670320872.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/03d7b213ddf659f0e9e1f265f7754e55/8614707961.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/xirawotimoku.pdfIn PDF document text
    • http://belloverde.net/emailer/file/xuguxutijezud.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/pejakagesupogojoworokezij.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/34338977803.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/42701942107.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/98190189258.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7826cb41---55651196671.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/34230114149.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/39748562151.pdfIn PDF document text
    • http://huiking.cn/uploads/file/140957265557.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3d261c492a340c2bd429c8dd1073ac83/24554078195.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/meparaw.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/21343760022.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/jejitavezudafopexaxelires.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/sakefixuzumuzosigov.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085c01fe04fc---271179132.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_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 17196 bytes
SHA-256: d1fd2f68b80ec9f578d69aa158b86e8b109c249fc42a7de6ff995dc3de4e9e64
font_02_sfnt_off00014b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3B 10812 bytes
SHA-256: e49c0003c67664fde53b39eea8ca8a588c9faa6d2bebd03961a8581fde88dbb2

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