Malicious PDF — malware analysis report

Static analysis result for SHA-256 4905c919804953f5…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 16:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c110cf68962daefda66368466827ffc SHA-1: d2f7cf59e248cc1e9c588de02fab4d634f98b7e7 SHA-256: 4905c919804953f59d1af11746b52f2f5be3714768f8cbcb30f5ac5b10b568a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=convertir+a+pdf+editable+en+linea PDF link annotation
    • http://lakehighlandsrw.org/clients/863582/File/gufozubaruxiruxelapifabox.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/74759952482.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/37667025812.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/oh10pflma27oi85fmpl8o3pppf/75619670620.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/zetetofofatetamevididofe.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/28825342582.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/gaxuwiwojigunifilokavag.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/gcu8csc6eb71t5f3finejh0ge0/xedefipujuzoregozoj.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609826d184136---xozovowajegelejupa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2697b67794---ketab.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf61472c058---28071921030.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/22895703926.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/95444092047.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/51671423511.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbb9ea5be8---37249765000.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/21682788979.pdfIn PDF document text
    • http://splogservice.ru/content/file/sirawu.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/dabaxitizixoluv.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210828035235_1810379417.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/15904562609.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ddbbd9bec---nodijimogupe.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_off0000bd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5D 10560 bytes
SHA-256: f366c371b0147dad6f65a7b58c42d8d6e22a264eda84d07f1a9f7f6cbabcc05c
font_01_sfnt_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 16832 bytes
SHA-256: 1e3db2964adf2bf1f2482f424d0f9033f11bd054b8aebc37e085e85364fbc4c0

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