Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dba56d13c50abf…

MALICIOUS

PDF

90.9 KB Created: 2021-06-27 21:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 10e8b76df20367b68faf7882f9e77722 SHA-1: c3d5b3832b87bedd1da6f471b649942d9a57a54c SHA-256: 41dba56d13c50abfd2981ab215bcc39ecb4ad56870b6d5f891c23e57042a58a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites that appear to be compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/aeb2b0817c3cff018e28ee5f776c53df/jajiralomen.pdf In PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608710ca0bb11---luwezodisedo.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/46747603227.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f2d9ec1357035def0757f88e40fa4b55/womirexefomugenirele.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/zuvupivomov.pdfIn PDF document text
    • https://asi-filter.pl/files/file/60213753737.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///61564062082.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/99693314644.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cf840b500---9635580926.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/keferivozanovu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b0f2de3eb58378b1e03d6c35706775cb/segati.pdfIn PDF document text
    • http://artospace.com/pics/file/juxanujatokalizatukogus.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/84172397760.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f667564b8---64021207537.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/98591756342.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c9c6d9727---derizigorimumajonovirum.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/38a3125e102d41af247c396ccadbff2a/38592556797.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070422776b0f---zopakopezi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/131400e4fcd15373c0cb1d1b3e186243/24110566158.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d21c61b3b60---94794087141.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/43020899051.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/nelelawasekozefejolokomo.pdfIn PDF document text
    • http://alkanboya.com/files/file///pogojimizijarorexom.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1tobe0iicug1oslvjhh855ovm0/90793959650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=not+in+this+lifetime+tourPDF 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_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 10392 bytes
SHA-256: 9b0a1a8ce578374c504332bce7a95d2628107964070559dabea96b69ce540540
font_01_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 16432 bytes
SHA-256: e60cda3a53e637c835bf57788bdfc4b6d8fba54f624c3f72a1b9ef158b8cecdd
font_02_sfnt_off0001464f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1