Malicious PDF — malware analysis report

Static analysis result for SHA-256 723031535c618be9…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 20:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1221c31f54c8c9521f139a8f3a28a028 SHA-1: 997d1e17904c74687a640df590b98e724f7bfc8f SHA-256: 723031535c618be978c7249dfdc8833827b02cfe2f827be0240811b0d9b6ca3d
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with some links pointing to compromised CMS upload directories. The presence of these links suggests an intent to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/85b3c612cd31c00e3ee8cb9a70e18636/42324812324.pdf In PDF document text
    • http://turatabor.hu/media/76344974347.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/tawezejakopotipulopuxexa.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd26580e0---32449809694.pdfIn PDF document text
    • https://pecintajp.com/contents/files/24440473472.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/64992009943.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/sesemapuwuxenezagexux.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210917123704.pdfIn PDF document text
    • https://somogyplusz.hu/files/givus.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/31254019787.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432bbaaba51---gudodedagogutonufiwupolos.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/rivufuz.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/rojukijosezixexuniz.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/vivaw.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210911_70A143F27E580C18.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/73900238166.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/19371078452.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/30606517088.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/jumilinotudifojofo.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/fafawedifofozexubaf.pdfIn PDF document text
    • http://soles2walk.cz/data/file/9060950728.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/44743354317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+put+music+on+your+sd+card+androidPDF 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_off0000b3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 17520 bytes
SHA-256: b5d0e69280d81aa400c23f987c8ffa1b1390b63d61362cf9ea9b1d5fc598605f
font_02_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 10788 bytes
SHA-256: 35adda15a7d555c9794bf273bf99f5d033982261f786dc0006d07ba1e056c27a

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