Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7066c9e8dbdd0b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 14:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e03cc8d82ab19fc63d77c38c1b7e771 SHA-1: 8ec54ebe57947bf144ad77a1352d6b1d2d5694fa SHA-256: ae7066c9e8dbdd0b96d2caebdf18ac5904d313f2cc17b2524e0d179c1416a8bf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://pixomot.ru/uplcv?utm_term=gta+5+hot+cheats+pc PDF link annotation
    • http://unionasset.net/file_upload/spaw_upload/file/20210901234020.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/pipen.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/48916792814.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/lixikafidipevadupusinu.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/pixubonujonomejum.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/72143149825.pdfIn PDF document text
    • http://topp.pl/_topp/file/vejominu.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/45137749014.pdfIn PDF document text
    • https://bdata.vn/upload/files/97819560531.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/lerefis.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/todozitil.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210904/file/16307251313717.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16312661758611.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a968e32b6---16167192929.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/97927711427.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/zorapexisirikasedimonitiw.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210921_8CD84E68E08F278C.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a46cdf5b0---28436119001.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f53d9f21---lamig.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/24693630653.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/daropesuxazixosifobonabub.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/pepekenuxipovidujovo.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/mikegalumixumano.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_off0000aeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB3 10304 bytes
SHA-256: c88bb0bbe36d9c608f942d8a89af217f9a3a774b6da0a1e80a18660369142438
font_01_sfnt_off0000c62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 15564 bytes
SHA-256: 533a238c7912bb540c749d230087c15678be25eb39ee27d566a14fb2f024f5d1