Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9963fc955f0cce…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 06:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ab67820c698bb594ae4926c8845ba700 SHA-1: 848135ccb3b3971ca92628eda349c99a56e694c6 SHA-256: 6c9963fc955f0cce9dc02d208875485842213dff0869f1700284c08260b4f5f0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://fisioterapiasuzzara.it/userfiles/files/91222012632.pdf In PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/kelixunelirilizotu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/nepaxopebokuligoxederi.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/fovidaj.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/4478137149.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ac88f428---69556051986.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/sezivixagewidadov.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/visajanexamegevitanona.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/62459286998.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/zemulate.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/61700658052.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/nukoji.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e11640974214b1f37e8c4eb720bc6386/20745654730.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/venaxiwuzojaku.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/589027930.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/jinividoxekisubijutegopo.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6bbb8ec5051b5ca0aea9e9e91a479b54/75080451366.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/60444762893.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/migegow.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/30929978108.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/kuvanavowir.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f947a8844e67a93dac2f49f9f16609e5/dowipebib.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/vomofajesepu.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/teravegogajak.pdfIn PDF document text
    • http://sungder.com/upload/mijopodeza.pdfIn PDF document text
    • http://rsst77.ru/upload/files/26844586003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=atualizar+android+galaxy+s4PDF 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_off0000ba53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA53 15864 bytes
SHA-256: 609247741cfa6258caa4b4d3c4594f7e96d8e5f4e3a2e2882cd609a15ea419c6
font_01_sfnt_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 10728 bytes
SHA-256: 6adc1bb465372db1f71c0db238ac70c1dfe0f9f281f14eab56386fbc9e964b79
font_02_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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