Malicious PDF — malware analysis report

Static analysis result for SHA-256 16280c904f0c04d9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 06:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9733b0108d617bd4e69dfc54ca8eea35 SHA-1: 23fb4d1e0f4d3e18b46a9898ea586508151136af SHA-256: 16280c904f0c04d9f1e23984ecad49be29e2eb1ca0fe3787d65c2f3a4ac6d2e5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites. The primary goal appears to be directing users to potentially malicious external resources, consistent with phishing or SEO-based malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coffotea.com/uploads/files/202109102326538704.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7d8e8e95---14318133475.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161413a5996920---9590858794.pdfIn PDF document text
    • http://yilip.net/userData/board/file/10233953966.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409dade0725---kejifekositit.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161411d03a902e---segerovoguvuve.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141632fbedcd---jetoxikan.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/24475913164.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/salomisol.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/84787063161.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/75677391444.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614162538b66e---43872633133.pdfIn PDF document text
    • http://didula.com/img/file/zobegufoteti.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/damolezaxoxejofasakaxap.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b73adb174eff91a0598dc9e8066a8890/59450937784.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410fb56c4d4---54625985333.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/55940300182.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/12542667580.pdfIn PDF document text
    • https://mangallagn.com/images/file/gekufuzuxusovavutog.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/bosojed.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/gibijosoxemosadanere.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341aae685bb---65026327672.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/8579184394.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/pitejinifeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=grand+theft+auto+android+cheatsPDF 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_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 17732 bytes
SHA-256: 0c683e3f98893e7f5ca700cce2d456d34b4bb546620e885e7da15e49ed265495
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 10668 bytes
SHA-256: e7903e09f3f44dbcf862d0acbae5f7530da9fbb9e94e04bfa9f8e282a01e7877

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