Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b892d79a5fe9c16…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 10:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52bba7fc0d950f6fd3cd95075c0c005a SHA-1: b35f49ec2912074376d585bdf37b06e59dd74dc7 SHA-256: 5b892d79a5fe9c1645e1af0cf6280625e978f22076d14f56f995a95b5859d33b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting it is used to redirect users to malicious content. The presence of multiple external URIs and compromised CMS upload links indicates a pattern of distributing or hosting malicious content on potentially untrusted infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://oniceh.ru/uplcv?utm_term=belajar+bahasa+korea+dasar+pdf PDF link annotation
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/esu27noe0rrqj6un4shttkg21c/45337806446.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/54199609176.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210830230139.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f50728052d---kaleduwi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0525d1cbc6---69774940827.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/44933727779.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/palamegiruvoxawiwupalefa.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/67932457772.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/pafiwanuvatisepufe.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/61d94ebd2f7f411d920c6e89fa266bbb/89143390520.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/21849334557.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/16251938953871598369.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/63402334910.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kuwewumevuxu.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/furezejoxuti.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/zojipomo.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/filebusiselugozilexuxox.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/baf7c6492bbc5675a67d8ef0b5c90cc7/bibalezobibarugub.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/40667992012.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/70544044668.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/36342644920.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c86b3916c78bce81e9aaf73ef858523c/texulosadavudes.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5cnirns8v2j47loj71l0mhh1n4/bunipiziwim.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 16728 bytes
SHA-256: cbdb8511b028eb8887bbe340bb1e6b777297debfbcd85e925c697a6f00aeb1df
font_01_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 3120 bytes
SHA-256: 64741e7efa3971566a8c6e27b242f502201ed28763ea09c9834afe2ddf587f7f
font_03_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 10716 bytes
SHA-256: 1015029a859edb14ebf99d18dd1a7c3f888057a5c6c1521b843df4011064e3c9

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