Malicious PDF — malware analysis report

Static analysis result for SHA-256 705a992f5da36c0e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-08 17:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 277655f2ac2c4cc22a8d479409548a4d SHA-1: afad04bdecee92a8db2be63f166e072d967d9337 SHA-256: 705a992f5da36c0ea14eb5936c36814cec99ab7902043b1a565ba0e4aeaf11e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content.

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://wastran.ru/uplcv?utm_term=m17+pistol+technical+manual PDF link annotation
    • http://1night2daytour.com/ckupload/files/30262446199.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/08/66441373496.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/fesofuw.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbd8284ef---82468193978.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/63770357705.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/35770815808.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/gurexigapozinamurimokug.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/voxujixifetugorukumi.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/fuzenolumepulodoru.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8ef8bd54---buwixutotajexefesoki.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/dofuduvefewavofovujijubo.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/96651638846.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/15555208176135fcd4a827d.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902040824.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/todilugowipotewe.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/13266894450.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/bugazodamutowovuj.pdfIn PDF document text
    • http://profstil.az/userfiles/file/47065884169.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339df07def7---27213629232.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/5965075491.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/ruxiwizofonetutinakesuk.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/vudenajalimipogupuzi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161373f497efba---xavazonidojejeruxedoj.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/82437125239.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/pozupemenonupuzulopuxor.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_off0000ba6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6B 10736 bytes
SHA-256: 4fe411138e0c644a9770385c4710379e838f78d2442bfa451a70ecd06acb96ea
font_01_sfnt_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 16964 bytes
SHA-256: 90d9ea8bf2ad1164ccd0eff4d9a292ba57e602e4391af5c8d9c6e59d43caa5da

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