Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1ff4ab90e9cd27…

MALICIOUS

PDF

89.2 KB Created: 2021-09-04 13:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ac30d26c651391b1c27ca1e3d73cc37a SHA-1: 13d4c4683e741748ed0e9a558451f9aedb1ed93a SHA-256: 0b1ff4ab90e9cd271dce63376b586bfdaaa4e5c3d6e0269fd4e4c68318e25798
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://rebizplus.com/userfiles/file/fiwenumopebimosizole.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ueb72i6v1f762rmkumvrm4er96/18799972538.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd9b373734---puzugasujixibunigowukomib.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tejesivirir.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/tapiluluwedovodivut.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/zagerudoxavus.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/76358597997.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/pekeputudisobare.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/47966274696.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/73645796957.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/28328790674.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/ferijowifediwemetizas.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d5f025f5c---wawubimozowufoxoleboza.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/tejogeriletapudoparobo.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/xirufibovivozedafalufi.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/metasegeletax.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/34862191530.pdfIn PDF document text
    • https://tekartltd.com/upload/files/50386350130.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/94404ba8352168a9b2491c35de639b6f/57904566072.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/27402082487.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7c5125640---12064010026.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d403438fb---70080972240.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/kijepejoxowivozezosep.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/vudotugogelalugap.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/10dbb13b70e962d8e4aee49293f2ef22/43701088341.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b71c6ab1de---62781554179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=waterborne+disease+list+pdfPDF 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_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 18436 bytes
SHA-256: 7a19ad803a23fdfa0b06f6e7d95a7a5fd7f61246e3ca97c644357535cd572fef
font_01_sfnt_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 10624 bytes
SHA-256: 5bfd86fedf35cc8bcc06c8f5a098994121759da07d7cec772787ceb039ddf9dd
font_02_sfnt_off00013ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1