Malicious PDF — malware analysis report

Static analysis result for SHA-256 3156b753c38b9e93…

MALICIOUS

PDF

92.4 KB Created: 2021-08-06 04:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b2e660632315e9385afd0e37b7129bf0 SHA-1: d17da96083877f16aefb30b13efa6587e78bace1 SHA-256: 3156b753c38b9e93feaa4c48c963ef53f0621905fc29c86ab9d21b7610784149
164 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are identified as link farms or compromised CMS uploads. One heuristic specifically flags a link farm pointing to a compromised WordPress upload, suggesting a distribution mechanism for further malicious content. The presence of a 'download button' lure and the ML classifier's high confidence score further support a malicious intent, likely to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://tz5168.com/uploadfile/image/2021/06/25/file/20210625_124905_107.pdf In PDF document text
    • http://orhs89reunion.com/clients/77823/File/pusenolopamolade.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/tozigozuruxirewazi.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/5c5e80edf1b25953aaeb6318f0c35cf8/jupanadunovojalu.pdfIn PDF document text
    • http://planetamama.ru/files/file/77701452457.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/18896789912.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15bd097a3---lawokamukadowopimadase.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///nomojepaz.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74e6d2c02f---murufe.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/47554797573.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd832ac6957---sukalimobamorikutozu.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/josuo6njqj28arrkop121buq39/35475260774.pdfIn PDF document text
    • https://longhoang.vn/upload/files/buwejo.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/29b3f11619a21c1757d4bdf3a41fc95b/zekewaxowavubapirumajof.pdfIn PDF document text
    • http://terminsk.by/pics/files/38629959763.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd524cb4dde---povidibugilix.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/luwewozam.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082de66be9d5---rujaligibijekajovox.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f6774018---duwijesopone.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/10490642754.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1424b9705bb01ac9c2aa95fb5c9b0310/suxojepubunel.pdfIn PDF document text
    • http://greenbrier101.com/userimages/39206223550.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/9013866825.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/naturomalunenixizufelo.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/68845958956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=beat+maker+go+mod+apk+downloadPDF link annotation
    • 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_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 17788 bytes
SHA-256: 55f5f5bf90081cbe184fcaf954849fba13545812d92ca6a499488106936f59af
font_02_sfnt_off00013231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A48 10708 bytes
SHA-256: 0cec0cf29d948f94c868b9f473b1510d476398d126edbd7b0f3ee7ef30ad5789

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