Malicious PDF — malware analysis report

Static analysis result for SHA-256 4486cb9bb6884cf8…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 21:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e115c6e88955d65e1b43529262f5b1f SHA-1: 3bd1e6be1fa9193de88d45567111f40a970c48e9 SHA-256: 4486cb9bb6884cf8cf565d731b255ed629c8170bdfc64ed46cfbf6c756a2a100
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=show+wifi+password+samsung PDF link annotation
    • http://catherine-massage.com/ckfinder/userfiles/files/88263489794.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/gelidujeluk.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/luwebeb.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/4420531421.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/tasojabudiziju.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/96924256774.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/merikowifolifegojupupo.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/10700263440.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/wapusalenixibopuwozu.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/10574385019.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///33222911807.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/85462611282.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/80782408853.pdfIn PDF document text
    • https://vitanov.rs/files/sivutojoru.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/pebonisotukijak.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/18474467576.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/99625818261.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc5cd99bd0---35457875910.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/ratexavuzaxagepuji.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429fc172488---39127312601.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1ujrupd7qdm62toj04p54021nt/fupubugukeronakopomedera.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/fedaked.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/9302966328.pdfIn PDF document text
    • 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_off0000b2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F1 10928 bytes
SHA-256: de27dde61d76909c6672055a302b48efd9db0507a8180300cb7663e9f1ab95b1
font_01_sfnt_off0000cbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 16412 bytes
SHA-256: fc7795720ba609de0ff8150cff4ec4316b60067d627bac8a22c147c58cb3db93
font_02_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1