Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab85bbcdb7193f40…

MALICIOUS

PDF

142.3 KB Created: 2021-07-31 16:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f694d1433c1eeab3d69dcdae166aa7d3 SHA-1: b8555eca5d04547d3d0e432d357a4655e2b5d12d SHA-256: ab85bbcdb7193f40ad63eb6974c71154ae6f71696de4c1ccd57ec75a53e6becc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The presence of numerous embedded URLs, many hosted on disposable domains or compromised CMS instances, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://wphs67.com/clients/9/95/95f8299e8098c1f2c85aab0f7ead5e97/File/63048787597.pdf In PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/70446f294534e40289b1c9bd34fa4867/raperovex.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8db380b705d0fc10c11d23bac6a71cc0/86845251381.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d457c1fa1672fba65469c0f38831f162/24838199093.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5dcfd489c---pesirativiv.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/18198617888.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608375040d423---23653053050.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/pemaxojizudigovuxal.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/f65fa82eedcb3ad31cf5d9a057ae591c/6737517966.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/97186090352.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7dce3408---60004665069.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/vetiterosapuvulonejubip.pdfIn PDF document text
    • http://surtek.biz/image/files/20150115_180558.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/xidelemuwiginevelosezin.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3625d4478---xodep.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/kufaxubatovakasanuvudiv.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/zodisibafapamoxesop.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/208666754.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cd5a246ee---89637331617.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ca13b8e52e7---kulepuvi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e5b2ec46af71456a3787860eea14695d/56095550689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=los+patitos+feos+resumen+por+cap%C3%ADtulosPDF 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_off0001c59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDB3 10760 bytes
SHA-256: a601454f3bbbec3fbd7b6a70dc4b8cc41a84544056297ff668af46879552b954
font_02_sfnt_off0001f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F66E 19836 bytes
SHA-256: ac2d79b60afc25826f2436f9417e6024aeb06ecdcc4e66a6ac79a58f23c4e285

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