Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dddd635807d9a1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 17:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67421e4dc0e237bbd5634cd43fb812d5 SHA-1: b947138078cac8ffc6f3cb3cc78e5a63063811bc SHA-256: b7dddd635807d9a1cfd59e5c4d812c2100dcb5599bf2cb8d1e159119c0125ad9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters suggesting tracking, points towards a phishing or scam campaign.

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://archism.ru/uplcv?utm_term=best+film+download+app PDF link annotation
    • http://laserbeautymachine.net/d/files/masaxepuxapima.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/39627173565.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6a24a0cd65f60c73082763811eea4ad4/61436564040.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/87235638909.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/91314129795.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/rixigiluvul.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/59639029111.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/pbc9pbqlo752g9m73hcp4qs1vk/91207154459.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/votevomilaxapikuxeweg.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109081433221291.pdfIn PDF document text
    • https://cooperspick.com/files/muwunijopalixukozenu.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/fe8be1e50c6d85846c890c10fa5f2650.pdfIn PDF document text
    • http://rooptex.com/uploads/rikagewisufebunusaledira.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/3587005238.pdfIn PDF document text
    • http://gibisch.biz/files/files/95775715469.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/21047759312.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/vefakexowonivoronugamavi.pdfIn PDF document text
    • http://tianfonmm.com/d/files/bijivupifuwi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/29f132c2091a7af29f02848467f7201a/livepanodebilabilanupidog.pdfIn PDF document text
    • http://reopen911.info/media/file/98682486518.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a2fe59e94---13835759547.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/87679840875.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/96683322287.pdfIn PDF document text
    • https://tpk-m.ru/files/file/gagabazibim.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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 18652 bytes
SHA-256: 935447c39a4a46271910c196b16bd67063ac75330505e9cd96c9d26b8c9837d1
font_01_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 10700 bytes
SHA-256: 0a167d847f6c3e75b4e7d656d1facff5de55614fc0dfcab25efe43f160766905

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