Malicious PDF — malware analysis report

Static analysis result for SHA-256 053305d594f145db…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 03:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fa4f53282e35c057f67e82f08235e82d SHA-1: ac841f498dbe0e101081921ab819f9d2a596bda5 SHA-256: 053305d594f145db9773a1d6b691b1c84ef74ed812b3724698c53d4ecc777112
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://jcbcharpentebois.com/ressource/site-image/files/nedosefe.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1610eba1e979b6---11882666513.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/buxiduxajesazumugu.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bodamulodatevaba.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/60152118521.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/57390872939.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/9462285654.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/1j1qqb8urjf5ncti7tm2kfrc51/berilagenududerukagav.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bedade220---77090040100.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/lokibapusekofilarabiz.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210807204905694.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160866aaab3c66---zebepipepoxunal.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9ec25a44a---wumosasoboburak.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/bovigojisobibadigotagon.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/gakekaradiw.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/56969781027.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/bd6f8099bacffe376a89a6ae4572da43/voxiretekewuvusam.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210516015553_2ktvne.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/74300602143.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/27876849766.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f02d208a---xusuredawusijojof.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160981bc78342d---23777658777.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16124dcac3b363---9133613211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hardness+tester+machine+pdfPDF 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

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_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 10712 bytes
SHA-256: 5015dffb86cca3ebee3a4094714d1ccb4ff569c13d991ef6798a0eeee216ee31
font_01_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 18024 bytes
SHA-256: 5313be794ba526990ff8c8763e37acc4c50c90a53bdbc0540036584d9474c7ee
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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