Malicious PDF — malware analysis report

Static analysis result for SHA-256 7143fa0175a52263…

MALICIOUS

PDF

107.4 KB Created: 2021-08-13 05:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 314ba7f52594edbe6fbc8359a5ea2fcc SHA-1: 919fe333a00cc949f2bc2d962db11d252a173926 SHA-256: 7143fa0175a5226335d359c5d98877cc18c4aad453e532abbc9c16582b194126
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://zlhk.ru/upload_picture/file/20437799527.pdf In PDF document text
    • http://modero.vn/upload/files/6209793701.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210731150425.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1baecd2d050a3bacf4bf176105fc6605/wazatezumudikibinep.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/43f66622b9542d291f4d35c98efee634/99287000029.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7acee91a6c---takipodomipukulap.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b4404438c69d8852a5040a4bf659945d/famijaxivelibimunozaj.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210715_CF07EB97A30D2878.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/torudijopazevike.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/sodafutiwinoxominawolu.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/21882170536.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/kp0c0ova65aokfpm6qs4q534hb/vavapomotuzi.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/tiwidojuf.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160747aea68c4d---70312885798.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/68999428538.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/fumubexakedowivobepun.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc92f61c5d---60353674383.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081504bf1b8d---korowaredobovopo.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/nomaparogagopunifowusajez.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d597c54a1---69777523940.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed0d99ed24---tolesixifoganozekovek.pdfIn PDF document text
    • http://abnicum.com/files/file/tokokomab.pdfIn PDF document text
    • http://korytnica.net/data/files/9807025939.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/53591391549.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc2924c1e---30679239389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=weight+conversion+chart+oz+to+poundsPDF 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_off00013fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB7 17264 bytes
SHA-256: f038c96fae7651fb96fb43aacc2401b2bfb60c7e403b2c9a5940be59ba25f737
font_01_sfnt_off00016d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D05 10964 bytes
SHA-256: 1dfb78bf3f83a14116c526b86018abcfaddb3be5421bb7b9444432264d40782d
font_02_sfnt_off0001864e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1864E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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