Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdff97d038b5f2f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 13:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e66c18909a363ffe86c76333435c6afd SHA-1: 283854aafa7ddf47b5342e2628cc4bfe8da52828 SHA-256: ccdff97d038b5f2f0e019aec838612ec14b2257c9f216864c17deeadc9517bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a tactic of using such sites to obscure malicious destinations. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://emons-verlag.net/testarea/cwsCMSlight/media/files/lisibixidifimi.pdf In PDF document text
    • http://pnmanagementsolutions.in/uploads/fepiwadilujuvefawox.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/1chklq9a6kv9oodbatdbhfar31/86810313840.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/novefatatorimoselinose.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3f95f597---zuredub.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/34419904299.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/vezaparalewenaxuzetazewe.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/virakapoto.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tulorudenumejumobewumezu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e76dea3974a---56737212442.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcafec24d01---rewusananup.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/35211194110.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/21556485778.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/magamirazomaxajuwadaz.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55877043802.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/79369965623.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/kekufuselujiwitafel.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/bolelojo.pdfIn PDF document text
    • https://cape-electronics.com/media/file/86211587800.pdfIn PDF document text
    • http://cpils.com/userfiles/file/87841463397.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/kipimik.pdfIn PDF document text
    • http://starsunited.at/upload/files/64715206593.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608835521e97e---12402182715.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/98341734623.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/a5a29csfh3at4nbii4cja8nijp/vezuradataxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=derrame+pleural+pdf+2019PDF 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_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 19060 bytes
SHA-256: 6d38e18ca0d98f86a31b152640457e24e4c4500a14c8ce341a59976e2838efb3
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 10640 bytes
SHA-256: b9894887302f15f1055ea82f5dd0215a1786424173b3457659a124fb666bb9a5