Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f1ada7a1cf03db…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 01:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4334f0bd787cfbd08894900a422e3719 SHA-1: 56ee1fd2ad92f0df91e27d8ebde36ac6f5f99894 SHA-256: 99f1ada7a1cf03db5a761b8c5a23ea4852a49e059c8615b8cffca12d0de2ff82
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are designed to redirect to various PDF files hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/toghbekijfv6420r0mp4l8bone/46888366289.pdf In PDF document text
    • http://sequoia60.com/clients/875776/File/disisiwekimiguwim.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5d3ea125---talenix.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/96571542572.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3138e1489208ac234e92e5dc4eadb140/pomibutabeb.pdfIn PDF document text
    • http://glttek.com/userfiles/file/99100510737.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/87444184720.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610df197a1ddb---wiferobojifatipajakuk.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/pedopuwivivo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084815fbc996---6180633455.pdfIn PDF document text
    • https://citytrafik.nu/images/file/xavadanalurum.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/65114486368.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718f8678bcf---vorujotononopiwakike.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f76334da7---55256936709.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/4127706631.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/loxixomovedokovotemarudu.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/kixitinededeja.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85c826023---botoneguzujato.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/zofusebodaduranutiv.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/89107730729.pdfIn PDF document text
    • https://schmitz.cz/res/file/magumizamaroke.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/mogosex.pdfIn PDF document text
    • http://kodemari.info/data/files/kozoz.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/84968705139.pdfIn PDF document text
    • https://banghenails.com/upload/file/16778761104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cirugia+laparoscopica+en+ginecologia+keckstein+pdfPDF 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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 18460 bytes
SHA-256: 640790477039e90b88e26604e4cab250decb541f497d0cbffdd296ee58aa88fc
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 11016 bytes
SHA-256: 0e143e7d6f6436016a2a1d10b3d430679946f48e5fa1db211d3be80eb566d0d5
font_02_sfnt_off00012182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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