Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d32376f07889ea6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 03:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e6e7394d8792cc43f8b1b09afe4fadd0 SHA-1: 666f46b1dffe6ff78ce4ab2df78b64a9419ec950 SHA-256: 8d32376f07889ea60bb7a0b68af9f9dedf82e17a231885be2f610ba7520c2abb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=idm+crack+zip PDF link annotation
    • http://kuppersbusch.hu/userfiles/files/diwak.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334d962bf4---fetidogegadepetunib.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/tifek.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/zufafo.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/fawuneru.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5d77eb06---27521839197.pdfIn PDF document text
    • http://maintogelonline2.bet/contents/files/38331250839.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/q54famvgj3imekmfaoed1ihi8h/wogajezejazekepomu.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/61717175752.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9bc948a8c---7977337348.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/89136588731.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/kaganidiratelokutoxu.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/99385030693.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/35569687314.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/zikejudon.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/sozujosowetogez.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/73369825859.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/fosebunonupeso.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/97960534962.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/vemux.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/3069716992.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/48328036291.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/xazakezunibomomalumewa.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/sirox.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/zogus.pdfIn PDF document text
    • 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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 10112 bytes
SHA-256: 354036d047447fbadc6497895545dc41852e0271528c79157233f25dcf7d2af0
font_01_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 19168 bytes
SHA-256: 396e7137927ba87e66c58127181e7e5cfdff838035655a32f5ed9c74cfb2c096

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