Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7405a77e1536c4…

MALICIOUS

PDF

87.1 KB Created: 2021-09-07 21:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e8d0cc36d9a3a275cfe0b9cc7fd10ae SHA-1: bd079d8c8f302747ea2e8a87bd4f0e9936a9d0c3 SHA-256: cf7405a77e1536c43cc5aa3fd052bd7e601ca252a45621d508f96b728215c7c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links to external domains, many of which appear to be part of a link farm on disposable hosting, suggesting an attempt to obscure the ultimate destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://msiutilities.net/documents/lusufudakejovatore.pdf In PDF document text
    • http://ausafe.net/images/art/files/36861223458.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/8662527144.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f073fd9a2bc2bce3d3f4613359974153/57191951003.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210905_100118_4500.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/55146198535.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/10934420592.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/13915763459.pdfIn PDF document text
    • http://www.bandungmesin.com/file/31958733013.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/fexudoroluzoxex.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/79013659362.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/xoxuzelubebuserug.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1599da1e83---42377059378.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/jaxixajomunutixu.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/venikivufil.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b5197641---82671439188.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/69858438803.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a16fe28dc---lipuxot.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/042c3f2c0672415df35f9b00406ac8cc/paloramuratojubit.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/tofijopezopiwutalajo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/757052cb95dfecb1ee7a77174ea481ec/56818500014.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d608e61e4b5484667500fdd32c0096ab/63773178135.pdfIn PDF document text
    • http://ippon.lv/uploads/File/pujirumawoxabazegawujexad.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/25845823785.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/todubunaripokuno.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/jagelajenifumale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=manual+de+pointer+wagon+2000PDF 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_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 10820 bytes
SHA-256: 5b891bc456b646cc26bdf8297084537795714437634c66b650a3de5ac717c3fd
font_02_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 19116 bytes
SHA-256: d05c7031cc969cc23f1b95a7a66d26efcd0909fd310699f975192bf3aef6a522

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