Malicious PDF — malware analysis report

Static analysis result for SHA-256 828b49b18e8c9d3f…

MALICIOUS

PDF

102.1 KB Created: 2021-07-23 00:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6953ec086a047344da81e3e9c1d044f1 SHA-1: 9651262440d96cddf0e9374432f392696bfa50b6 SHA-256: 828b49b18e8c9d3fc2d61f8fa46449b290d4e90dfbb990f0a4f2f58c1080c6ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites acting as hosting for other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these linked sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3ccfce1669a8ff569bf57f5fed70cb56/revepukebudama.pdf In PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/j8okdnnl9gnifshj93s2m528n0/muvem.pdfIn PDF document text
    • https://reniuved.it/file/59968069371.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e214625c7---92128242786.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e4eb143df---kizufawuv.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7fa5147504ece9418aeacb92ae6a5f62/77014790081.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/dewisik.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8d72beed---8148570056.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8bcc254e5eccb600b730772fb04e553c/85204327327.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/nasas.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0af931399b52271c92c0de388e0db2c0/13817423694.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/28123141845.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2eed11c8cde4b02a3487cb91d2f4bd2c/11136137336.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/kebirazenisisibijejov.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1aa2b5543---97801439859.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/pagama.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/zujodaruzuzaxirigapumunep.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/78763906606.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fmu52re71pqi99aq1f7ocrkdp0/tevibopodabifalezetipo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160de154eef96d---50680254954.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/oinnqpvudlmd64dlgkie5p110r/37588424286.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/favovowakigimikewuwa.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/68c2faf59736b1a04002b1441de02358/15820297168.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/vijufefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=alternative+quiz+questions+and+answers+ukPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 18056 bytes
SHA-256: 0f93a9b9872c6eb17d5b706fe1a4613cf880432fbf3137dd8f2b96f17762b305
font_01_sfnt_off000143f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0A 16232 bytes
SHA-256: b646e4e99f19ac05519abaf59ecb91311bfd919e7d59cfb2ca623a477a188405
font_03_sfnt_off00017192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17192 10772 bytes
SHA-256: d83747d6735e649db37c02d31f1ab524b1cc740138d188bc78382d76ba3a925c

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