Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf532d7621d1d4f1…

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 07:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39c82b39dab5c9db60042ba72b125738 SHA-1: 4f44484e54f09e977beb69ea153400f44b95ade5 SHA-256: cf532d7621d1d4f11bda74cc6cf550f51202231b638075aca7445754ca11d294
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings confirm the presence of a link farm designed to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://balone.net/_upload/file///vewisuwinakedivogusef.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r51hp5p334vi2fmkp11panqtao/78244211069.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9ac00baf---muzuwawaxopigozebifir.pdfIn PDF document text
    • http://partnercable.com/files/jejoxusirinadeb.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/gojovekiwejekunili.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/4741911161.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/bilebavijo.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/texopedimobagajepun.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/98585256532.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/52245674819.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/welelokekigapas.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/zorirewedejoxufobuguzowi.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/morukigapivumigavil.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/81133757447.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/78166382910.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/36562933521.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/67564643395.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613190a02a5ba---wejapuzona.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/36874703851.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/zedim.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/xugetawawizodonev.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/babixudo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/tiluzebonalunapelo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139968536fd1---segede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=is+it+bad+to+eat+carrots+before+bedPDF 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_off0000bca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA8 16112 bytes
SHA-256: b0b0bce8b65b82e9f2905761b8287827e362d023dbd931fd3b03bd79e828756f
font_01_sfnt_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 10412 bytes
SHA-256: af4f8388a230b8f0886d4a4611fa0ba1a188ebcb8747a087d145781a48491c6a

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