Malicious PDF — malware analysis report

Static analysis result for SHA-256 1626d0e8d401a925…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 06:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7605ffcc8f5f8fabe0aa3dac3d2dbacf SHA-1: d8fab329b9758904b85d0ae275f838575cb5f657 SHA-256: 1626d0e8d401a9258e3290d335252b938b9e7b220485331ace6de611e1daee7e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=grand+theft+auto+v+online+play+free PDF link annotation
    • http://stapper.de/sites/default/files/userfilesfile/fepiligisever.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/52959028308.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/68271436231.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210902155636.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/fabapilesorilunuxogubab.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/70324483005.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v8k912q1l0ssvgokpg75ph9kt5/72561259040.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee10646406---49053169545.pdfIn PDF document text
    • http://planetamama.ru/files/file/loviguw.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vudutamijuvakikize.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/juwopuzivakudaxekedonexe.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/ripanejutijobuvenel.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614011708528e---70526651512.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/88307367474.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/xeramo.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/kogojisir.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109010549358110.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/75126344194.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a12357df92378118c780e10057a72c63/78222581775.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nolifaparuxopenelok.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/91382208813.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/61257723408.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/fuzisuxolinidunizez.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/54873264308.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_off0000c364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 10748 bytes
SHA-256: bd85e60d5d35d528a14331e7be23de54ba747d61f10dc6cdeedf4c0512e80a22
font_02_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 17232 bytes
SHA-256: 7a1ae29136d748bae25363b8f101c29352fe557246ffa675854f6204cae71f77

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