Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbad05619647a229…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 18:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 248499e4a51d694bc8d0d8abac7e63fd SHA-1: f93cf3fb30b350454d9367723bb91445da7e8724 SHA-256: fbad05619647a2297044b398c79abefd0720f5b320f72cef2b29cd496eafa3cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://polletnv.be/uploads/files/lobomopore.pdf In PDF document text
    • http://dydlhx.com/upfiles/file///64076245903.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8aec2db3d---28864839615.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/xeferu.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/jewobur.pdfIn PDF document text
    • http://anm-av.de/uploads/files/78647985798.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pejawaverodoxulut.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/somukenupugamavitezikut.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/fobifexagixu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b033eea49b---bosuginolubegunit.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/rilokikiruzezupoleluf.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/fozutasofudaxotiba.pdfIn PDF document text
    • https://ocw.tw/uploads/files/35009534212.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/809ee6028cd833a74be9fe62a7c34d9e/22607576866.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/bizelupav.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/baratawe.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dc0b240f39d406275fa90fc2a2df2d6d/xanuvigebinusegufimorime.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/fimox.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/3347830396.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/140148407136.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/63582495789.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/vogafaxi.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/lixulezefozurawufaxumu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f1b4672b85ecececdde22ad709dc5a6f/kuxoxanozozepesutixekepe.pdfIn PDF document text
    • http://unsersohn.com/images/file/88548681815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=eukaryotic+cells+vs+prokaryotic+cells+differencesPDF 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_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 18100 bytes
SHA-256: 2fe93ead3efba782fb79324ae832f7751818bf8ee19f228c8578ca3057948417
font_01_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 10968 bytes
SHA-256: d1b6a88920f2712a17c10a872b42d4dbb82cde9bb856e418cf1c79ec1a3a5122
font_02_sfnt_off00011a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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