Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b60d51c32f1f380…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 04:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4dcae10fc580786b0f0701f4323cad4e SHA-1: 4c6e29d257987f0e89d7ef1ed47b34538c647ef1 SHA-256: 1b60d51c32f1f3800fb895af181cdebabf675b7efe48ef63c5ea9e170deae331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to other PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting. The primary function appears to be redirecting users to potentially malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://topclassgreenery.nl/images/file/vatudovafogasuraxoxekas.pdf In PDF document text
    • http://dejede.com/userfiles/file/fewowil.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gemagumaviferu.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/gugeritajetakuputo.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/gifuvixefikikirifego.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073f628d12c7---31237841503.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/75845738029.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/73637476481.pdfIn PDF document text
    • http://e-sportis.com/images/upload/90238140026.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pijoz.pdfIn PDF document text
    • https://tl-systems.hu/files/files/72600140836.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dce1336fa---30130666039.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///2737955973.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5c0fbbb3c40a5ad0c01ec74badf2d010/30847081298.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///30338384286.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16126e75f75e16---58632819732.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5dd7a7204---18203262173.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/dozotalalavibokovufusu.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/45508199724.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815adba41d---36316830212.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/3349450285.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1de1e5e15---73693067017.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/jazupakakudavapisuged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=class+7+geography+chapter+5+question+answerPDF 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_off0000bb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 16292 bytes
SHA-256: 6c79fa85d1d15298ce7a1d74efacb8b174c4093c41b827a98294e24086816492
font_02_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 11316 bytes
SHA-256: 032cf7d0490d124be91543951321f65a78e1be004b66bce26b436f8b9cd586be

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