Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfb45d13565b16f…

MALICIOUS

PDF

94.3 KB Created: 2021-09-06 23:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 434117e0fab4b42ba8e89d4631a355be SHA-1: 5d2507f031a50f5497b6437dc4e2d3872500f8fb SHA-256: 8dfb45d13565b16f0550b2dfa54a49c1b71b8341fafdd0482618c4a157edccbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wittlich-luexem.de/userfiles/file/21125180508.pdf In PDF document text
    • http://accessprecision.com/userfiles/file/tuzip.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993faaa22d2---zuduxiwozodelubefigefegiz.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161148274beb0e---51910472998.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/80356543005.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/wabegetoxevomijexog.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/besugaxejenulej.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/fuduxumupovedexoretomiwi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9pnrkqeabu2l9k6tdvi9s5s5ul/34115084508.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/9416541633.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/nawabiw.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1627080710_1.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc08511ecc---vomotosevavulenitifuneg.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8060495ef15c1ea97460f4f23efc23bf/35344241946.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/40129886215.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/lumilufifatukilezikobiru.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/pijasez.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8058e4cb8---kunorifipujenalisenon.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/bc482fe5d96a8cbe3fcfa83056f7ef11/35902849775.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/96649549609.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/c4bn9gna68a8slv4uel462njq7/pimisawiledipatubosoroke.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/jogeji.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609413680884c---52932230600.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077935d2823a---demojoramimagatudoxal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=parents+feedback+form+for+preschool+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_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 11024 bytes
SHA-256: b6d6ca4696c8022df9cd417e2facd58223444884e5d97b57d5fd654200956573
font_01_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 19112 bytes
SHA-256: f71a4369975c2c27214c4ffeedc8e73659b1ca714e24dedb85e580c8034f02d1
font_02_sfnt_off00015307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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