Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe9c97755d56db3…

MALICIOUS

PDF

80.7 KB Created: 2021-08-26 10:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b05d1b8183e70e9f9a0ad722a4ea7199 SHA-1: db8184209ee0d01e8232660bebb584de0c80a928 SHA-256: 9fe9c97755d56db3dafb8281d2cb76a80e3514e13bdc6cd3626d09fbb4e4fd75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to external resources. The presence of these links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=how+to+make+a+dog+name+tag+in+minecraft PDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aab04d3c4---miterojimipuzu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e39eff53c9b3f26ebbe4369a56cab4dd/dafevategasaxadebatepu.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/182bbe062c8bcc0c2c201d686c84dbd7/natasexe.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/loribelojefidujisinefuro.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/rifafoneloboso.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b0af889b489db941f970cf7ea30173cc/5048306029.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/98934932024.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609743ff37ee2---78618424275.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a3e2843b9f9cc39f7d204ef1542ac0c8/wonosutamuveg.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/16268452214.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3ab387d5---74970634816.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/97425505344.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/58878607581.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2013d6211---tefawosuwikuwovasuwo.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/gaxiviloru.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/19017503886123e71f706a4.pdfIn PDF document text
    • https://sapporopools.com/contents//files/85288727302.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2070037f8f---tadodovolapusanigemofimu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ca35000d646dc42e67d0e42812a23ecf/motigagebol.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/tupuvuwutivurotowine.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/73db363057ef7581c5e1fbc9edd7f7a1/78980341240.pdfIn PDF document text
    • https://aspirans.com/files/file/40493458654.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161009fdd7aaed---gixiledawodebij.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160787159315b7---xatifevozosesuxewi.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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 16676 bytes
SHA-256: 9816d42737b6bf4506150166fd35ef110a0757f24bdc48a203fbfae703ab7b01
font_01_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 10772 bytes
SHA-256: 5f612e95799cfba36355767c19adb696d5a706418aaf64cd4fc51a80ab7c66ff

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