Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f5658abc6b6890…

MALICIOUS

PDF

166.1 KB Created: 2021-09-02 00:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a61a49b2eb1d694c07623fdb3918a69f SHA-1: 012b77e113fbf6ea18a6bca4c4b902a88a09a16e SHA-256: 25f5658abc6b68908411104b1d06fec5ac0de0ee0af39720b91d56ae66142b4a
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 functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://placc.info/up_image/gusujebisijodatux.pdf In PDF document text
    • http://charivne.info/images/file/lopafenodoragirol.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d9da7b5ca---22818193146.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8dvh0rrlj5mmrur485ktiqa7i0/32385566589.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///zumoboraf.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/5150162370.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a8205c1bf49---misalavajog.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a6e9ba2d7865eb5c1db3658fafe5690f/gudafuzijijubamasomi.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/86815985149.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4b6a120e801f375f30798968c85b14fc/52529417832.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/nisinopebamejakivufuxaxez.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160762009ab08e---18800861975.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jrs4i540ggjacit16b0k7nnrm2/revud.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6493ed57---11788701134.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/laxavewinofazupizu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6db325398---97938857904.pdfIn PDF document text
    • http://www.520amis.com/upload/files/96386172313.pdfIn PDF document text
    • http://bienbao.net/uploads/files/vulima.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/melofove.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/mamupisokomof.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/60553568293.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/85034794200.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rv352jekj37mqvutkfior50mon/bifibikejavepa.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/58237076152.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/6d3f745f8a0a4ecb3bcca7f864d62a86/tulivadir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=as+an+object+is+heated+its+densityPDF 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_off000229ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x229AE 18176 bytes
SHA-256: 1dea103c139e7275959e197add4e94a7b926833396024729372db23f22bc8f8e
font_01_sfnt_off0002592b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2592B 10688 bytes
SHA-256: bc89c51d1ebec3676906554e3b6b77af277ba54725097c8beb443264e8321201
font_02_sfnt_off000271ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x271AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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