Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e0929bcda48119…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 17:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b67f8ba05f63bffab60a4cd96b3b0e3f SHA-1: 5a96095971a14da214482c54641dc1989be98140 SHA-256: 57e0929bcda4811936bc2297782f794fefabb80073a29799f6e3cc4b3959dd76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gd-weimi.com/upfolder/e/files/20210916032605.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce70d2602---87159386614.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xiveje.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/33873423548.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33740583060.pdfIn PDF document text
    • http://shophouse.info/images/files/xobolatefarolikotigebu.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/56401686973.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/47168662395.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/wugugunebexuf.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/fusabaxotubinofulasif.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/movimovexedolorefawopaj.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/zomuzolikifasejadadeve.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/99790035669.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/85070773724.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/venototewugowefagozonitud.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b37143b542ff3cb6d74bcc92bc09bdf1/sufap.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c153483a9e---55831383201.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/gixidadovuv.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252cc3ae81---zavuvojorosekexadakaparu.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/lofoletujegeg.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/42052541386.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/zotebomekozidugimute.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/14715389027.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/bezogupilujimuvipeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=play+store+fix+apkPDF 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_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 18388 bytes
SHA-256: f7db026772f1e0265b283e89851a929a70543ba8d9a01e7bec237dbb2070c378
font_01_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 10556 bytes
SHA-256: 26f2182884a8f7d5fef36f9b959027c9ffee4c13105ec99fea81a839c172ec2b
font_02_sfnt_off000133ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1