Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23662d5ef7b6d19…

MALICIOUS

PDF

77.3 KB Created: 2021-09-12 07:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ca62edfe696e4226bcdb81b4d6c2c2a SHA-1: b443a69a9fe1081233f29e152ea8ba18443dc44d SHA-256: d23662d5ef7b6d19097b65e868f693350ad6d1d468a1edc9b99880a83ec7938b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=thomas+paine%27s+common+sense+pdf PDF link annotation
    • https://astdubai.co/userfiles/files/kegoxafo.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/92138645534.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/99879060533.pdfIn PDF document text
    • https://inks.bg/userfiles/file/kizodesagokalozu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161335dfc97d34---wijinelimeso.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cb7vcpc7j0qo63olgd5kpcfoa6/pumixesogetijilazunof.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/84553855265.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091016050641.pdfIn PDF document text
    • http://sung1.com/upload/files/95492665497.pdfIn PDF document text
    • http://someteme.com/archivos/_20210901095312.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/87707587202.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/fitudenuduwulonanuxud.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/peboxemaram.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132402772a2d---sediposu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b6a7eebd---vojasavopibi.pdfIn PDF document text
    • http://szwygs.com/upload/30760587619.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/pudimuzir.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/72733140556.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/voxanemofol.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/44597251711.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-8/20210908193605467431.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/90737029530.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/83935159288.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/4835620937.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/nipomibebokutir.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/93314490716.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_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 17588 bytes
SHA-256: 1d359b4108ea8ef8ee6f665e3e2e4b68104809171cfff001e9eb2ea8163dc6f9
font_02_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 10640 bytes
SHA-256: c8551d6b78991712d263d6baeb3eaecfa1b10ca116515c6c77c9b4c2e753f845

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