Malicious PDF — malware analysis report

Static analysis result for SHA-256 b518c94e65e68c47…

MALICIOUS

PDF

69.6 KB Created: 2021-09-14 05:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29e877cb1d31db87a9f8befb83eaf04b SHA-1: 846d866e2de7e93d9d2f151c87dff8bbd0a8262d SHA-256: b518c94e65e68c4726f2490a0cab157a66f3f52378a7e4ee7118ca8c6643a7fe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming on disposable hosting, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. The primary purpose appears to be redirecting users to potentially malicious content hosted on these compromised sites.

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 https://martensmgt.com/business_school/uploads/file/26121205538.pdf In PDF document text
    • http://dastone.ru/userfiles/file/nubowozufigekakev.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/26324735410.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb77386e6---xusozatoki.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/vusesosa.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337b21c1b87---lunixowataxusugo.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/turowibejules.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/31388237222.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/fekisuvi.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/julelakajarab.pdfIn PDF document text
    • https://majubesar.net/contents/files/16402205959.pdfIn PDF document text
    • http://inphilong.com/upload/files/fijifizekapedabugisaze.pdfIn PDF document text
    • https://tl-systems.hu/files/files/devopadanoletiniw.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210903_234611.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/nerufezajilug.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/41989095825.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2e5e3e980055bc37a3339f9616fe7d2a/pikogoraduxelavedexawag.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/89055702678.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/27217623723.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/niwelafiwabepumas.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/rimomowevuzinijaza.pdfIn PDF document text
    • https://adium.ru/userfiles/file/nasidupe.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/10215897788.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/55690407576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+blob+runner+3d+androidPDF 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_off0000b135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB135 10472 bytes
SHA-256: b0b80ca8e20ee39de001a079a288b67553a42e5ac6ea196b02605c40f0347595
font_01_sfnt_off0000c91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 15588 bytes
SHA-256: 3756b956182e2d1be8fa7fade79b70528b97f86cd727f39821d75aa3ed9783a7

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