Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4b2ac24c28cb6d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 19:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29620f68764c10b55eceffeb28754bb0 SHA-1: a765e24a673cfd6f7716994e266052ad8914ac28 SHA-256: fa4b2ac24c28cb6d703e3ee9474c6af7f4475d37db9e996dc18fc6e870eb563d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this is a link farm designed to redirect users, likely to phishing sites or to download further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://garglob.ru/uplcv?utm_term=weslo+cardiostride+4.0+manual+walking+folding+treadmill+review PDF link annotation
    • http://everest-c.ru/ckfinder/userfiles/files/97190581618.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a9582c6af---putubaxeximo.pdfIn PDF document text
    • http://cortabellanews.com/userimages/pedinedumikebuxiropi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eee44d493---ziroluburibededarux.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/bajedumadafuzomotupakol.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/naxexojuzarefifesuz.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/35179147697.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nagari.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/burugatazovonumakodixiv.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607480dccc6b2---jinixiz.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7eb35cf13b89934493705159e559dc33/palaxedawivufesavup.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/15883130789.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/pagofuvuwugiduwujofipag.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/71309179225.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752a2f5ef85---34512325634.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/sefot.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/wubug.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/76431354805.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3f033618---64097243487.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/donesoxeripaxoj.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbad7a4d12---dafukapofomet.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/pupipopesenisudise.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_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 11424 bytes
SHA-256: 4ea3996cf8c3b672d524a909e7e24cf549201083ae8fe7144feb546f43a8ad30
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 17836 bytes
SHA-256: 86813a729615ad5cb7b31772399e12c32aa9dddd3908b3f306ef18c496a06a3f

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