Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d2e90fb218d819…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 23:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 74b6cc7426bfdc2e2ac18d00dfaa7fee SHA-1: c3c714c15989d83d9affc995c4d95522d27fb347 SHA-256: f7d2e90fb218d819ecc1ead195ae2443454257cd49620a34d629c11f5f0327f7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

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://perfecthospitals.com/FCKeditor/file/putazoketajof.pdf In PDF document text
    • http://ipceurope.com/assets/file/pikitid.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i51e53vvt392dr10cktao6pkbh/pelexozowul.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/buvusebe.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/podenikefuxudumizupadur.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/piwebaxigesuligipaja.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/60701134785.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210908061552_Nzg1NTIxMjY3NDU=.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/17546298078.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141680895612---wukigodafudosesoguto.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/soxiva.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lofiloxasorijopowoguniri.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/73823475411.pdfIn PDF document text
    • http://chinalabware.es/d/files/benefono.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146792f2877b---wodijiduzaf.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/99667646018.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/31041577217.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/zujesagijeba.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/2266603625.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/lubudovixedimomobod.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/10147350472.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/22287671362.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/47169416301.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6cfb1de0837ec02965f2de96c2d0ee59/sanifawimopuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=brick+classic+apkPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C7 18572 bytes
SHA-256: 69664626a7a64b5234de21b0b0620a7834ee189ea26b95d62f0242a707603122
font_01_sfnt_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 10056 bytes
SHA-256: f1b0e6a20d540e1c029fea2d6903e2561524c8129407dbc816ba0960778fb0d0
font_02_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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