Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3a0305d9f03ad4…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 13:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5f4eaea32df0310814466afe9971001 SHA-1: 5d6f04e8adff6b26faf8e002af2ec95e505f2a75 SHA-256: 5f3a0305d9f03ad432cd88c0dc804e7547dd546d0e31cc2482716703b8f9c536
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rougezenekar.hu/files/file/xapudenufexusukos.pdf In PDF document text
    • http://toicodonlyson.com/uploads/files/23593932828.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/88201627626.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/wogaladitaxoru.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/53499021085.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/rawujajez.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/batomovupilesadobev.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/barefudimip.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/90514381980.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/tabonaf.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/35104803529.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/67ff99733b7c6c3a8f3b5139cd7b280a/21516829892.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/51648141569.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/rowafagedekexifaxaxuguro.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/rupeweretabinem.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/62691b51ae9125b62d56792a69afad37/zakesiwipix.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/nonubudefizu.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/26893627700.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b9fe1599---xuwaludibu.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/gawadokavo.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/24e3632749b6ee2a7fe43581637defa6/57208148082.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/47139731834.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0817850b7d6d8ab763f5ca0d7b4de685/52747512586.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/88021504010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nzxt+h500+case+manualPDF 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_off0000c65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 10676 bytes
SHA-256: 103c76fd0cd7abf66fbd0958167d9f04f95b0567bafdc0234ae5ba9bf5205abb
font_01_sfnt_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 19068 bytes
SHA-256: efdb8719f42b59ec7cff3d7257ec0070408439c32a1934e302f50892fe3eb60d

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