Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0aaa6703334341…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 23:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb24e93374e3e50e51642838ec2f9f59 SHA-1: f250b05148f172d3e447318e297b87c30c404b25 SHA-256: bc0aaa6703334341f8b5a2f70aed6f1aad9750e4296f4cbc23ac227dfe8d5cca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of a ML classifier flagging the PDF as malicious and ClamAV detection further supports its malicious nature. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=converting+word+to+pdf PDF link annotation
    • https://advantagelic.com/singhania/downloads/file/mutifipamejimar.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/78388088604.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2874678b5---83249500125.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/lafiranositowobawuwoz.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-16/20210716184340178407.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/37910025894.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087bad68e6fa---wogujefosemubametep.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090eab4b1c9b---26817481233.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/27940137946.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/74955847233.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f64de7d3e---tolixuwajejefemovukis.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jufiseviburuzexexapezekut.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/dopujisil.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/98310904728.pdfIn PDF document text
    • https://fond.ru/userfiles/file/rowemamije.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/vasilafujalapedafavik.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2773b0b7---11389210035.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd3bac22b---zuwopovokamiluvekuf.pdfIn PDF document text
    • http://contelex.it/userfiles/files/fejuzogusijazejabibupe.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608448a6d0e3a---rosoledewibizusi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8fe39e749153c177d03b194d52411a1f/felukeja.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/81987097359.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/99a9566ca15d54947ca4aca553852f55/pefesisiraj.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jewakebupuf.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_off0000bdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEB 10480 bytes
SHA-256: e8de26b5b69d09438709a8588a51d896a7f8de3efe613c101f6238e7fe0dd968
font_01_sfnt_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 16760 bytes
SHA-256: c52c7bd85d790592d26074cf66a391a2475904d321651da14abc1ccccf7750a9
font_02_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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