Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9ba72cc54cfcf8…

MALICIOUS

PDF

331.0 KB Created: 2021-09-24 04:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 709636b790fbb5ac99fca3335b2794e1 SHA-1: 76be32566b14e99d5d571bb946a482d44ec01fb7 SHA-256: aa9ba72cc54cfcf8760d00acce711ab262e86b4fddfff5653b480789fd4e4317
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous embedded URLs, with at least one pointing to a compromised WordPress upload directory, suggesting an attempt to host malicious files. The presence of external URI links further supports the phishing or malware distribution vector. No scripts were extracted, but the overall structure and URL findings indicate a phishing or downloader attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9778

Heuristics 5

  • 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.
  • 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://beta.nhatthiengroup.com/files/uploaded/files/75334992391.pdf In PDF document text
    • http://jatechkj.pl/upload/fck/file/kumujolo.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/sujifabewot.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/nitemoseb.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/195d2a3ed64c9ea7fd7ab4bf8f1d2641/66666796127.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/53589821984.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/50342926884.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/98268565476.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/gatafukesuxiwigozax.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f133040251---48324557771.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/34893861565.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3dff48b05---54007076223.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/potelubumebirubevepu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161395114ad6c6---29185555626.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/mobanidew.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/lumafimotupagefojarikudi.pdfIn PDF document text
    • https://mtdind.aicsmindia.org/ckfinder/userfiles/files/duwetapiz.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/4688123294.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/66364831175.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142238ab12de---36819695989.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/sajap.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/xefomoka.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614d133c7116f---zebofuvazafidamalakawaga.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/34506568116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+umbrella+academy+comic+pdf+free+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_off0004b972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B972 11024 bytes
SHA-256: 6b939f4773c1dc3eaec13a357a21b9d27afdf8115dc16e28c178825fb2fef755
font_01_sfnt_off0004d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0004eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EABC 18996 bytes
SHA-256: fad7d0523dbf5729f0df36e1aaf0c0e57a46c6c191a756831fc3941ff067e7ac