Malicious PDF — malware analysis report

Static analysis result for SHA-256 b621fdabe2b8b82c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 00:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77120bd2162aa14ddb1fc646e49fe737 SHA-1: 8fd26743f6579c8ed5cd95d8674ecacb5454950c SHA-256: b621fdabe2b8b82c495108e54d2b8694600b3e5521f6c74c54c8485c259c1c8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611922463828a---gumejedevozasemegawe.pdf In PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/80414958208.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9u826hbo98shj1qoudgnnv4ipf/sebopasaxibaxutirogiwawat.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43f3d8e79---58849312196.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/3bqig0gecv0ltd4vtd29fptpg4/28813036476.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/22720780613.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097dfde9fcf3---35493733564.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cd94629b8---dikojidixakiwosanupa.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/relurewafomefomojewoxawul.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/26548483096.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/54580137698.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f759ca0f1c---punuzanivuropevubetexoka.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/tefos.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/xibenumuraxapa.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/usbcr68uk2n4oeaii345b8i5b3/tileredeb.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/768608008.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ce5e0ba0f---79143776862.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/xagenafagomewurawudaxa.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/12578029057.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/diwafobevor.pdfIn PDF document text
    • http://landpas.pl/upload/file/farurena.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/bafapenoneworapefuxibu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/r6hggn4j0u1sk9oj5a1vsl5bie/78483289318.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237c1a0ac90---sejesisejonujadugukijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=origami+with+a+dollar+bill+easyPDF 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_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 17572 bytes
SHA-256: 04f977e60dafb3729e171b17a73d3999896efaf7e86b0ab702b6eab6af21fcba
font_01_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12659 10956 bytes
SHA-256: ce163c5408ae6f23d9c8f35191c7074866976dac27d3cae67c4927665ae1f794