Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3ecf4c6392cafe…

MALICIOUS

PDF

82.3 KB Created: 2021-08-20 20:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a713ac20980a8204bdd8cb3f2c4bac9e SHA-1: a91870ea195b0aeea9affd336165c8fe76651ac9 SHA-256: 3d3ecf4c6392cafe796478a1e14b51ca273fd9d141da56a8dd28b79652343b1c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/91q2voce25d9lsmnneemd0d3ac/dulixif.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcdf32d0ec---26047465614.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/dererute.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/verunirunijonovosiledofi.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7892f757d7fcd9a33bf8db7d9146e398/35927021307.pdfIn PDF document text
    • http://ihdbd.org/upload/files/dimugetedumoji.pdfIn PDF document text
    • https://yuss.it/file/jotopugibajogutekabaxatol.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/0ff1121e4ee86eb1fcfbcdc8e885b648/kodajujix.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/n3gojp0oujubsh5vameqi81bts/pufibewosutawapugusatumob.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/43352189241.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///kodorub.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/kedunimakek.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d8be847feddf19af9bdd74c014eeaaba/641482635.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a10bab95---89517153463.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607d430e4fc11---63605865268.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/gevajeles.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fd6c68d87---57356832747.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7838d43bd0fcc0b3a539723cf70cbe25/61037144245.pdfIn PDF document text
    • https://ksboutlet.com/file/files/wejebunigok.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/7582393275.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4kc4dr4sbhlmj5rsfcsu0rm6o2/29897542116.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210802111028.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/24694844013.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210813140546_1231iu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tabla+de+frecuencia+ejemplos+paso+a+pasoPDF 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_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 11016 bytes
SHA-256: e778a76c01654209cca4ef074ee08fd57acfd160bd616f41299ca2884ca9bd0b
font_01_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 17052 bytes
SHA-256: 964312cde4eb25e7f19974f31b43848ab83ec8cf0ca60478a1c46240ee8d78ec
font_02_sfnt_off000120ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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