Malicious PDF — malware analysis report

Static analysis result for SHA-256 726ceb1649c1dd0b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 10:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fed79e3d6fc0094614bfdf0be91ffac0 SHA-1: b347c6e27054d797997353544945f70202c879da SHA-256: 726ceb1649c1dd0baafa94fe667f663b56e6e42f1748c1a37d9ab4c4f80cf675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content, likely for downloading further payloads or harvesting credentials.

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://szekszardportal.hu/userfiles/file/39618367017.pdf In PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jusemifenefoje.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/6cf0e1a03e1b2b4e43d3d1405bd5297f/maxokenesobivosozeba.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2f0146016---lefogemevowokajefumi.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/memokidunimaje.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091615493973499.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/vebifapovilinesagesuba.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614457eb88ab3---pukufamuwaxes.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/guxixunujuvug.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/pukivitiz.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/fidexinum.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091322565142.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/98151854567.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/xotatoloxugatoxul.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c79fb87daf88dc11bd1b07bce4e8b9c8/semiwasa.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/maviriter.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/73838921308.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210911140310.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/wemapirukix.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/rikejotutidaxapapafavoted.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/18/98552066899.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/nidupodanelejulunaxoresip.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/zojora.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/2504691515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+mobdro+iphonePDF 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_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 18280 bytes
SHA-256: 31d6abd64ab0880c57156b8c013ae5360ac7ac03aeaf578dbbe63cbb8c1fa3c5
font_01_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 10620 bytes
SHA-256: 9ad0107a5f1e3e0baa642273b1777b766c08c4c6c7ea203830f2d3c9fa0eb439

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