Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dac93d9ab92fde9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 12:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f788a99e254435733bd89fcd832f964d SHA-1: 0d145e6b155bf488f86882afe442a815d2ec9c5b SHA-256: 3dac93d9ab92fde9ef5b09667c17fc068e659bc2525dcba60d4f8528d40e74e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery. 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 0.9960

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 http://yasairamenbar.com/uploads/files/junafuzipeturudoneli.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9163886e---pebomutodowo.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89611877564.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/mibutidusodosefarozurosap.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/nudawa.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/18687632994.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/81320321341.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/41734259584.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/xarafakevowugofaremaja.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff0e42ff32---62004967900.pdfIn PDF document text
    • https://manenshop.com/upload/files/numogadekosebunade.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210525221434.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160820fa0cae2d---wutukeguzure.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/bf51c2cb8ab062a7d5fbb0a7ee0db162/pebeg.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2926608ceac7edc0d7318b5d07a7d621/zitujofirofisorakil.pdfIn PDF document text
    • http://balone.net/_upload/file///5154029053.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/49242748910.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/63373023078.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ts7cnt9bld5fdka66ftd19v5a6/vatofovesesumejatutoxejo.pdfIn PDF document text
    • http://synfarm.com/upload/files/25340098918.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/20828035181.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/pajetekidalapizuketi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8915865071---86003807765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=batch+convert+scanned+pdf+to+searchable+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 10884 bytes
SHA-256: 0f3c8e1744860daf0d2549dd004ce44a2c0f2c5ddfa487c3e2ac25a38d5ac83e
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 17808 bytes
SHA-256: 9b8d02f72eb8f78ecd26f77981abd2100d811390cf3b5df84efdb4ad311c9543

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