Malicious PDF — malware analysis report

Static analysis result for SHA-256 d027d2ae943ce5af…

MALICIOUS

PDF

86.2 KB Created: 2021-09-08 21:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96ec22320ed55aa9f75a141e91281b8a SHA-1: 492fcb42c8c97334cb80232a834fb79baaa66c1a SHA-256: d027d2ae943ce5afdfd409c094cb1fd61952053e630a50ee1326308636c025f2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of external URIs and link farms on compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=toro+self+propelled+lawn+mower+owner%27s+manual PDF link annotation
    • http://www.americaninvest.net/upls/files/sapagawevuzal.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/85403958758.pdfIn PDF document text
    • https://mihalex.by/files/files/20720904261.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4196b5446---joxapimekobobezeriruzo.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/98052415957.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/92349964054.pdfIn PDF document text
    • https://renault-service.com/userfiles/3457167563.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/vekowokibamoxuwuxi.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/nekixapetupufolofetovuxib.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/veperugozaruninavipazoxel.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/15112281469.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/82607884662.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/mefixila.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/jomoriwarazakufokewuginow.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/57863344367.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/tedububutixod.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/kalatoxigipopabe.pdfIn PDF document text
    • http://only-svet.ru/upload/files/pirotiwosemezap.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/muwute.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/70553320827.pdfIn PDF document text
    • http://salespate.com/userfiles/file/11394507742.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a4e19a3d---95625542708.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dfe255e2b88550772558330e72cbf22/7341060614.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/vanedava.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/53352689798.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_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 10652 bytes
SHA-256: 519e9e67a46dc86805d715b86bbd192f0bb8473cde8bc5310a699139770ee254
font_02_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 18152 bytes
SHA-256: 527b05fee297f16b0e7e84ea72885adc59e9ec173e444c68dd26ab2abcf147ba