Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e9ee6301dbc144…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 12:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9680fec4f288801538ac25a7213bffa7 SHA-1: b98a21a4157e5e658dc33f7b9205909a2b74b0b2 SHA-256: 52e9ee6301dbc144b35309a6fd140028739543a0d5e692619ee08569016b4de3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings suggest an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/depejiwikomuxe.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7jftjdic738r36beuen0d74jg5/vekelejijikariw.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/3771983611.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9195d9666e36502132b54fd12071e885/22963679720.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/rokolosizitonex.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906230416503.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/r0v1lkejeoigsbfenvprkqnkrq/najikorumimomubu.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/lejeguzovezixelenotazof.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/30625826267.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/u041ibks1npl3ige3eljvu7935/pawisi.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/resivuworigadu.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/xulumizena.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e5bb4e280---tevugetupakuj.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/85833585282.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/80739158891.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/nisoganu.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/98280472066.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/72116437564.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/pifozuge.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/53c4721c686e8ba3ffb796fb95a5912f/sexanelegaf.pdfIn PDF document text
    • https://synersys.fr/contenu/file/dobogixufelenokofi.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/58132682627.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/51919398442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dffoo+jp+apkPDF 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_off0000e46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 9832 bytes
SHA-256: c96baa85c525492e9b98caf16390568b2cc9d1eb7c504d37d7a9e3a78fc48eda
font_02_sfnt_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 24432 bytes
SHA-256: 0899dbac2fa84786971fc8ff5ec0858cadc7055eaf0aa728b2cadbb119295f1c

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