Malicious PDF — malware analysis report

Static analysis result for SHA-256 0422625310378ec1…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 20:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19130db5669edaeaaeb5fdd3a198ac3f SHA-1: 5abe0185118e2f7cebbda2ddf0f4c50da1602fed SHA-256: 0422625310378ec151c274c18d5719d7de9b2348986122d37733e195ba496701
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the heuristic firings indicate the PDF is structured to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://turismo-galicia.es/ckfinder/userfiles/files/jomojepip.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087222841bd1---79896694534.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/87716978033.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/gerivatenibogakem.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a294b5dbf79---gomizirujazajofupapenixot.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/34008900234.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f818e01383bc45fd1bc03e843833f33e/26299082399.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/nopajodo.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/jitevufovasa.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/80459155798.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1cce5732---vuwarisuxezamoxir.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/46872997615.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc9680a38---benafuna.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210719_041856.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/35176fdaea3a7c426f4fc5567f3970c1/jilegigupabubolurisinura.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/14732521144.pdfIn PDF document text
    • http://expresskaliski.info/file/85873309789.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/9460253776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=meningitis+pediatria+pdf+2016PDF 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_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 17400 bytes
SHA-256: a9a9eae360adbb84444ed4d41761f7c6c6d5f9b6368083fe44931863ad9f04f7
font_01_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 10964 bytes
SHA-256: 7efe648187764cd3ad29a3ee30a2dfedca9937194e4c7f3310d3fd1020452280
font_02_sfnt_off0001342d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1