Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1d9380744baf9c…

MALICIOUS

PDF

84.6 KB Created: 2021-07-19 10:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f8516866709e8f6c4a2fdab914e061c0 SHA-1: 41cb8b61b99714a6e163fcff6ffe9d1759157b8f SHA-256: ae1d9380744baf9c8927bf90fce2df16404fcfe8d6abc74ac094d8fff5b5b941
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to multiple compromised WordPress upload directories and other disposable hosting sites, consistent with phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', and an ML classifier also flagged it as malicious. The presence of numerous external URIs and compromised CMS upload links strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://deurenhanger.nl/userfiles/file/nosenoduwebolokixi.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c49e74ccb91---29654016562.pdfIn PDF document text
    • https://actor-conseil.com/files/file/59937645373.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c882f89b0c8.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ce7d0398---69142466952.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/66825055671.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/21089318046.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/wununuzeme.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80714e241---47432548285.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d192b13cb---45801596112.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160762b77eb3e5---44128549393.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/93576567610.pdfIn PDF document text
    • http://short-story.ru/upload/file/19351267233.pdfIn PDF document text
    • http://magrubber.com/images_upload/files/bufuretukusatumeferew.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/moxagade.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091394758b34---39960887830.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/43602595205.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/m1rri41bqb8bilepvok60s3db6/dotasibogusuxawekabexa.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xugejolumifawinotufita.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/97562348762.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/51566918893.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d2a65edc0---rekosabonedeguzegawej.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/vqnghs6js38roeloni5o504vor/wegufutemi.pdfIn PDF document text
    • https://ptogel2.com/contents//files/87113035437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=artisan+cooking+questPDF 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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 10680 bytes
SHA-256: 5567665286eb10d5e83ba70f91ea8367142d5384c417db6ede410a9a50668d5c
font_01_sfnt_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 16660 bytes
SHA-256: 40c5b73fac2014c5263ff46675c630850bc8da802b230a203b96b161f77de112
font_02_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1