Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee350bf2cf74414c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 01:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 52cdbde7824e58bb55ba562c3a37cc4b SHA-1: 9be5d1daff08253fc4f0f6a87840ab68d717bad1 SHA-256: ee350bf2cf74414c4dfb5e04697e3c67b71fdef2b044bc2a335906b120e9265b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://shesob.com/file/files/dadipetupuvizugawabujofif.pdf In PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/zeluminurimosefoteta.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/31505892913.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/49984351014.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/36037524357.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614048941cc0c---59543476306.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1c2b7200---resazivigataz.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c7a6db92---wumuvetileravo.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/36242863312.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/mojawebigumuzetol.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/donegirivukized.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/xilesagofopusisog.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/14505323000.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613141e62f763---66037888312.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/serunodotos.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/laxuwiwunirovifodelipu.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/dasisesok.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237870dc9b---97346806686.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/kewegogifikimidatedukuv.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/50668302938.pdfIn PDF document text
    • http://blueyee.com/upload/file/171807158675.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb644873f---76131806500.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/93579959099.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/zirupugukigakagoriniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+unhide+an+album+on+androidPDF 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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 10660 bytes
SHA-256: 05c687676b075a92553b4c876aafe3d70e0b4c3483603c3e12b162dd69828e29
font_01_sfnt_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 18944 bytes
SHA-256: 63852c6088fc0160be8faffe3eba06ae04a97d75eae909ad8a9758ea1d6557e3
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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