Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd7a7333ca8422a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 22:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58e3e9899e55e8108684c6407be84551 SHA-1: 7b8193fe2d44be70e94d11f810d9b21410893b1b SHA-256: cbd7a7333ca8422ac5586477108c9b37a35e31e840a47ed78e586e76820eacf0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an effort to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=how+to+use+texturizing+scissors PDF link annotation
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0cfb894695d569c6b343987ff63163a0/wiwikorurinigodapinatiz.pdfIn PDF document text
    • http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/pulevarupu.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/47680824916.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/8271121388.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/govujakaripij.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/72974498246.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612e92c4e02e5---21669471351.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tesivofop.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aab417ae763---37828918260.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b019118af---betuzijejajutepobesas.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/64625421856.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0e72e514eb42a8a035c547040cbeab30/pizuvumagizikalinimukuw.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216301119591875.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/belotezasimoleworuku.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a783fa5c3a6---35145268813.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec1c7b60c---43932213426.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611225c0a6bb9---minizidefaj.pdfIn PDF document text
    • http://ozari-ua.com/files/file/mukomutekibasewufirovudor.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/id4cc77ue7n7jd2deh48f5dbbe/89736105668.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/tarufibexoxidiz.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/fopirivoxadafebazusasel.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/zemaxakulajixivavagut.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/25726550697.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/kamazexu.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_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 10536 bytes
SHA-256: badc0ffa774b093608be6062aea1ee40c6c713ce4896c9fa0b887a25e98a80d3
font_01_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 18344 bytes
SHA-256: f51feb0714737e88a22c1f2c08a9bcb411265f1ef4b47be15683bb5d17063a9a
font_02_sfnt_off000128f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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