Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fe7510366abb71…

MALICIOUS

PDF

111.7 KB Created: 2021-09-01 22:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 7e418c1eb71d0711073886d26d488daa SHA-1: 3e217366c1270772c01ff67a869b3d32cacc6d38 SHA-256: 66fe7510366abb7167651ab12cc8703582c3d45220f9a61ec19832b0dfd82510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple domains, many of which are compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ph789.com/pinhsuan/files/file/riferedame.pdf In PDF document text
    • http://vibrator4you.cz/UserFiles/File/maxujetuxelodemapugi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc24fc6118---vunibovut.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/rokipupezesala.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/79gkv5tkp7augm9lc73s8d8kk3/rizeruxinulelolakin.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/de2a307972f1e9de2a3be2abbd788ca0/65699224978.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9a3def590a594a22d848e723e60a7de3/solasalapobutobufuwexisub.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6g84kkntcd8gbauqb6o90j2qi7/38225538054.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/lusaxogiwela.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/winutoromoloramowa.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd533504ca0---papefekunoterolutonojeve.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/korevufavuvuzokijesob.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/49338727998.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/55dbbb6678744b04c5c800fe2ab6bb9a/41985958386.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bfb322aed615e5ab401038482d74a688/larotoxibokuxa.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/45220890411.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/botagitiviloxuliw.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/62960961080.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1d05872d45b37c4f467b386441031d1e/71186195300.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/6715314794.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/buvuruvove.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/bodoxopenafulawopagoreja.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/32224380187.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/xivugenitibap.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/47184371506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=while+my+guitar+gently+weeps+chord+progressionPDF 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_off00014ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000164fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164FC 11252 bytes
SHA-256: 38a96a1f4b6f94692ae090908d76737a043e291a9c4ecf27b785e2bebb2fd57e
font_02_sfnt_off00017f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F0A 19044 bytes
SHA-256: 96342151a3b0247ec14bec374eca355a85eb2b081cc6edc6cc41af1ee6d33061