Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dd846396a2bfbd…

MALICIOUS

PDF

96.3 KB Created: 2021-07-16 09:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1afd58e2168bc9a397c80640492c93d7 SHA-1: 4d0ba5a31bed4ba90fff549a15cb4e5861490858 SHA-256: 53dd846396a2bfbda0fb94c851b829aa66d6b40df7dd7b5cbc45b699d54ab5f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting it's used to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF dropper.

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 http://hanhthien.net/uploads/file/169480600.pdf In PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4ed1852da1b3070da6c25a9885ce9b8e/32908406334.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5faa33dff36d0ddc15b706a0f06234b4/15203530220.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/33128487239.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/6028927238.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/aca7f04807c5396c9e1c6ac95a68a974/rekubotobalegoxexuzivelo.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/wuzadawawidenukej.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f2f13021020db75d97c209bf4640e221/91873182413.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d2da7bb8---37961394620.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098a85ceea7e---xaxalejutogog.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/23077474272.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c498b14bf69bac60f31d11548f08484c/zepozobowubo.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bb0f53da1a4b40887afa1dc41b2f1459/34199709489.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c4446d8afe6e2ad95cc8a4c69c1fd9dd/94557514328.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/55260670702.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e3557dd58fa---jinaninesak.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf77e78cb9---81028629994.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/karawazuleb.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/mokapuvudobiwuko.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b164bmld9u0pc5hu5qpehcvj1c/10721301842.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a30ac83e1275239e0d7cf286e9e48553/rateponawujotol.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607858808f41b---pidutuvolusaj.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/09355dba1bc81c8e451dc2874d994e3a/sefuzagoporojikasidibopop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hadriana+in+all+my+dreamsPDF 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_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 18592 bytes
SHA-256: 4e9c029572d2d703300c70223f0e37541d128301f45e98a3bd94a796e712c10b
font_01_sfnt_off0001438d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438D 10296 bytes
SHA-256: 80f20d1568c3b4929c995382c7c0a568dd3dce075a2dfe0ef8620c6caf47c718
font_02_sfnt_off00015a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.