Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f00c7bed834c67…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 23:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3282a194d3999591bd424b138af215f4 SHA-1: 777f983d387560f2a769c1cd440dfab6f460a180 SHA-256: 90f00c7bed834c67a622f29cc9b4ebb2764f80510ae1a365a26a653d1d903666
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cbcom.eu/ressource/site-image/files/94237785254.pdf In PDF document text
    • http://vanharteyoga.nl/uploads/files/70208589696.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/xisagisejuv.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/41910868305.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/durixatupexaxanidat.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ae44a89e---javogevepasusomalur.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/dotepe.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/16f138cfc5b080aae518fb21b1cc83f4/likuguledafimumezipo.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/46659440928.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/84061836600.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb7ee215c5---penerivitanasililik.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/75700137055.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d119f58def---xulefufotusafa.pdfIn PDF document text
    • https://dellrein.ru/content/file/28381715173.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/vunaxudebixadawapuxakiba.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/xubenotofanop.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/6015176119.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614456f7229a6---77004084381.pdfIn PDF document text
    • http://ruihuitax.com/files/file/gapiridukiguferer.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/60822719705.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/17051948964.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/xuwoxidisikutivukepibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+stop+facebook+messenger+pop+up+on+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_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 17288 bytes
SHA-256: 14b3413558d0ee07d169a5949c64acd4ce921b6ca096584eac6e868e8c20106b
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 11324 bytes
SHA-256: 70ad24e66539e5a4f2553c102b6318409e71115eb28acef7048e86eca303a37d