Malicious PDF — malware analysis report

Static analysis result for SHA-256 803b447106116060…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 05:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5eaeb2a10e4d43d44282253e67f3fe93 SHA-1: 1ac432f6733c432e0b1b91c4e3f80a3764833ddf SHA-256: 803b447106116060a670ac9a2b1c6e58dd8b55cefd91fdbb26c27d1404ec237b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://pistant.ru/uplcv?utm_term=iiser+question+papers+with+solution+pdf PDF link annotation
    • http://thietbikhachsanvinhhung1.com/upload/files/wejev.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089094653f8f---pejudozivodin.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/338af6782f1b0709ff2162f87d5b3d9a/557774395.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/jevagulu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e3cd5bd00---46155163055.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/70767522700.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/futenumefotumoripide.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/3349400247.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8fdfbdc28c780af6a27380d7c3b90b0c/sarimozazimug.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/mirogewotazokojirutojefi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160783711e84e6---jobago.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/butokax.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/lajibivugo.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/fevuxifazejagivovut.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608006dec746a---netowuposufolajifolu.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/34008603450.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/48035038124.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/21482371910.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ffe0c7a0d3d75bb41246fdb38ba2fc71/51195892702.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/gubavevoxorunusexedem.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/83789997101.pdfIn PDF document text
    • http://beiks.info/public/file/limij.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/dilajovutunonupetudeka.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 10876 bytes
SHA-256: 78b67631ba9769ca417ea9cd3816089da1d6563f14956ffe46a4b365ac2b8729
font_02_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 18480 bytes
SHA-256: e5e764a8c1c6be56a8fcdbeda5418a21664d775e4b42fe6af17bd157850720b7

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