Malicious PDF — malware analysis report

Static analysis result for SHA-256 73620efe30e65f52…

MALICIOUS

PDF

88.3 KB Created: 2021-08-10 02:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d1b54fffa8a4419b9cbcf74d4dd1f6a SHA-1: 8663026f5319d90ec7ba32c9e6d78c33d6b92cd4 SHA-256: 73620efe30e65f526745d7f8295f3d79c372960c7e46e8fc50f892675f86aa9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate the file's primary purpose is to redirect users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/uplcv?utm_term=what+is+urn+number+in+aadhar+update+status PDF link annotation
    • http://danguykhoidoanhnghiephp.vn/Upload/files/tazirerol.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/177149138.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/wowuver.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c184ef3d---vipojupajifikapizawuza.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/dadomobalimawonu.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/4bc1bb410fca88ebe599aa51345079cc/49277200832.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/48fea4277eb925bc6147ed3c949dac3f/faxutavowegirigorux.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/rukave.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/51952363466.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/93357949433.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/rurarukevajifo.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/76001690170.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/1vkvp4p1rqadcvvbsf8bv3oqe3/54374038014.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/af2764b866dc47d75e647dec6382207a/nabewus.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/xezijitarafi.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/94504372803.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608123ed06a12---25215329744.pdfIn PDF document text
    • http://e-sportis.com/images/upload/56304001427.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/d79c9bd0f1e79bea6667208cb0f6c02b/wodorumevanivupodigij.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1cf8809a5b9fc284947a3be95c6ce1e5/fizufono.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/66799629130.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609acfe216ad6---87990080898.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607575792305e---lenurululuvazusogujag.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084c5b93eb80---kilutili.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_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 16812 bytes
SHA-256: f2ccd42c3287c99161715a8c6662612bb8b461a0b4e4778913f2a9de527a6559
font_01_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 10724 bytes
SHA-256: 2e4d32b056721bed06819c8aaf7adb4f9c5299a3e1f5eb35edf53c02a08750fe
font_02_sfnt_off00013aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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