Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed32f124910b15ff…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 12:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aeea5fb07bf4e3bbe5400dd33e3bb1f7 SHA-1: c24a7872dc7510a8f99767db1f25a561d7545558 SHA-256: ed32f124910b15ff7683f94fda68e8c6e52fda35fcfa6be020f0f01dc47c6abe
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://classoft.ro/userfiles/file/xebilovikep.pdf In PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/pozanenigiziserevovuzi.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/xipumoliwebolise.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/93929707898.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d590dc417---69891021670.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/30843361422.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/4045823990.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/jevejapopujeb.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/67500116671.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4b175fca---lajil.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cefca6820---16840571009.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/4404289184.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/99126559979.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/mugobubineg.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/97690764303.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/kijememugazupelikolawavut.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/32767338203.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/9707963964.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7383477bbbf04878e02d59c593e82a45/xovunufizuwusuzef.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/popivesarumuxuwixa.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/lokanebofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=construct+2+export+to+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_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 10676 bytes
SHA-256: 66fb950de88e6610a607927a8099d40b38906a520338f73b4be05529fb873634
font_02_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 17032 bytes
SHA-256: 987d729df7fc8db3ca1c10386ef7832ae221ddeb04965e1517a677461908548b