Malicious PDF — malware analysis report

Static analysis result for SHA-256 f429fa1477c47ab8…

MALICIOUS

PDF

99.1 KB Created: 2021-09-20 03:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90bca4ac138f3aee1179e154d217301e SHA-1: c19d0ea88c96052e155480c00f9b40d726339746 SHA-256: f429fa1477c47ab81d04edb47b90c9fc7f0aca08e8c3850fc376ad0b5f536bd3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of 'utm_term' in one URL suggests a phishing lure attempting to trick users into believing it's a legitimate search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=is+there+whatsapp+for+android PDF link annotation
    • https://alpinashop.rudy-ra.com/files/77260219281.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/4360566402.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/73306840547.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/kuferezifimefo.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/50639296504.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/zokusunabi.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/15870440200.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4ab4ae6794de4f2276c1a1f44c160846/ruposeroxorelid.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210905084515.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9150086636.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/11931140274.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/851ffa7665b24b7e0f2e97e3561aee82/suwibuzizelopam.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/45987198388.pdfIn PDF document text
    • https://menu2uplus.com/images/file/38746508844.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/77237586100.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/lixebimimawife.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/90377585027.pdfIn PDF document text
    • http://17njl.com/userfiles/files/72537200950.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d8b27f6cf59d327322b7249ea82b55fb/jotixiv.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f5386a77---mutujebebiguromimurale.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/34540432043.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9833f19252ed94ff8c8440fd116e9d53/sotiretojabodiv.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/28317040559.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_off00011b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 10588 bytes
SHA-256: 48ca3a9850f86b0ae8cfcadf4fb9b5c4ce1be2b4951c3062bf3eb18d34600472
font_01_sfnt_off0001333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333A 19560 bytes
SHA-256: 9f58953a5d20941de92d603545e4444455a8e97f852f5654f9eae6a44e05248a
font_02_sfnt_off000166e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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