Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff459021bdc829fd…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 09:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f3f5e9a0e71983c96194ca8d688c49e SHA-1: 1ee587a6d4e7db64e09164b3aea9329518b4e01e SHA-256: ff459021bdc829fdc99e7f41b8bc695758bf7e4fed7b4fe8ad00690c0f61dd27
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/as30alco1740pns7tmbstpmf54/vizoviranit.pdf In PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210908_5642DF30F81F7C91.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/xemepobeg.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/kodokeloturakez.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/99362854768.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/7901453995.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/57fe670415f1a7fef4cf9972fd433ac3/lupilelamogibe.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/35022550346.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/90142365112.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/molapa.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/vumuluxevowexozapudaxodal.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/69458676304.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/moxiwi.pdfIn PDF document text
    • http://parilka.by/var/upload/file/vejelozebevit.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/worokosebomina.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/megupuxumeduvenixudenoni.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/93283113873.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/95733197615.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2724fdb0---10749386324.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/lorarowatuxadi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/23835011203.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614113b360e2b---xarumose.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/14201283056.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bb89cda8d---50656976363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tomie+junji+ito+pdf+downloadPDF 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_off0000b123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB123 16904 bytes
SHA-256: 667170e33e95a74e45cfbca43b8bc537458d6488919fb19425fe18bf9f9350b3
font_01_sfnt_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 10668 bytes
SHA-256: 01778a480f59284e596e219f82fd860ddeb7997f34056d266c984a8dada9fdf1
font_02_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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