Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab15daee9a5f209…

MALICIOUS

PDF

85.2 KB Created: 2021-07-30 19:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8444f44ff89033ab8984faa1ffd49c6c SHA-1: 476ac98321f79cce1d94650061b69d651d00157b SHA-256: aab15daee9a5f2096fdc43bee5d269d205cefe26558b0c04a094829d7f8285ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The presence of these links suggests an attempt to lure users to external resources, likely for phishing or to download further malicious content. No scripts were extracted, but the overall structure indicates a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://wastran.ru/uplcv?utm_term=behringer+x32+producer+manual+dutch PDF link annotation
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1e7a5556f8692f588c3815f5885dd598/27667139124.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909094f1268---92790279697.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160967756dd246---kozijibomodefagipesi.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/d38aa3b9e976696c60d10e93882661be/78016239227.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/lixufuf.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/pobakenodi.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/wisesuv.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/wepivirip.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/de59e6dd905c0f9d23ddf7e2fb6357a5/zekamalebiwodoregokakupob.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hh33a4hn53mgbgnns8h5eum4fh/93835057017.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/mifesexogeja.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bddaeb3be797366bb1b30e0afa7f2946/38464913202.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6gvi91if08qcar1f0pieh5jt47/kiwegonokojawajin.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v4mtp3cksfja0mel8f2jd7hld0/40679751481.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1gt33r4r4g3an956pmlvvvd8r2/sejorolutake.pdfIn PDF document text
    • https://digireg.dk/upload/julemabefatowomibu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc9160df9c---57326376453.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2d47cf33---jubelefuledum.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nebaxezexetojaw.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/78775802054.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f242207db44f2c799e69782615c9d958/temewosobafobabolefovowub.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9f131749522ccd3a83bd94b21b3c7ca6/9697286667.pdfIn PDF document text
    • 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_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 11340 bytes
SHA-256: eb300dc8b690107487a71c89cd300c213ccb0adb13662dcf43752df65733584f
font_02_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 16112 bytes
SHA-256: 301f451f64dc3ef71c09cbe53827c3271d1cc97ac3d089a133998dcc11e2aecb

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