Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e57cea339e616b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 03:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 460afd51e8068ef07da868b93b7b4445 SHA-1: 307f69a2c281382aab48115db7f76ed1cf3e3116 SHA-256: 85e57cea339e616b6bdb010b131bba0e2f50889e3f8d2dabb552de9fb15d255a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=alguien+esta+mintiendo+descargar+pdf PDF link annotation
    • http://gruaszarate.com/ckfinder/userfiles/files/22194450573.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/64964175271.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/77801685737.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160801eb8b469e---segabaxifuponononusejogi.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/32281278509.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/c4hpfamebgnan7nn69sbd1l0jp/sozadozobosodatazubige.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/desogopisaxifojedum.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/64082225332.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/10690535271.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/63360492477.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/57449533438.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef69ed4de5---darujebivaru.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/xojadokopim.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc48a465fe---20456229098.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/47166243969.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/fumuzudasezebifam.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/dijub.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/60011812180.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/saxemef.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613559ebb5422---nipabuk.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p4rc8d599lgviucqkfqkuqkeh3/dapenamekeresitosa.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/577303409c1bdd4105425999578a3d9c/xodogagozowinuxemoranogov.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 11044 bytes
SHA-256: fac49e52ab6968abc12056d389e9c113729aff1a2a42ad8be8039f69e77d8b67
font_01_sfnt_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 19524 bytes
SHA-256: d67d453d800d2a079a7d3241b4a5cb50f2f0c89d93a267bf86283b77e999862f
font_02_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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