Malicious PDF — malware analysis report

Static analysis result for SHA-256 56affe58596b52e9…

MALICIOUS

PDF

90.7 KB Created: 2021-06-25 20:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4340770381a0141f28073496176f560b SHA-1: a7f540676d900aea63d92c66287e9bbda5f310cb SHA-256: 56affe58596b52e9e578d65a2ed231c94ff1e93f9694e0cdb3ecb9666c6bc6fa
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=daffy+duck+tiny+toons PDF link annotation
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c248b55a---95841829531.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/wuwusugugisopaduz.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/fedalixirixuxes.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088eaf20a245---36710439091.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f76b5bb8bb---61844036622.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/13669948103.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/95221046820.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/63229697185.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f68a4c0f5---35304795447.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c703dc6e05---jitufegudakepasojexobo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d2ddc2e0a4c6060036d810c34de4ea30/tojofovoroxatuju.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/fa836382a32773fb7f74eb54b1f8d460/dagezedanamem.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2e1d824bcb83438e336539ca356a7a2b/61478986709.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f724326d---zirugena.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dic9jepd88okl7ca97mjrf7qk7/xawamiduri.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e817ab5fe113586469b6528e54662a98/daperurezusapepowefibixok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd705f1e07---paxum.pdfIn PDF document text
    • http://uamarkets.com/images/file/36547928270.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd2d78b08e---betilibikinulumopojit.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6706828e33fb71734944f5dae4a9ba89/43663613213.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4599c2f4c7---64967731845.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/1564536633.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e7675add72b0759eec6451650dd5bfe/gederiliwa.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kimitazajutubaxuxaw.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/957ded51aea5a7ee5c44c89b764cf089/daxagujelez.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_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 10496 bytes
SHA-256: 13886cb69297ff0890a3a78360c0f6cae50f1c800549336cdf805d2a27b58f76
font_01_sfnt_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 17280 bytes
SHA-256: e38027d6a9af2c3e89701efc928ecdde0bd8062f759ecbcf660bfbfc68833965
font_02_sfnt_off00013d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001550e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550E 1684 bytes
SHA-256: 72bda604c77ca771a1a14ee35dc8ff354b9f00ec81e947fe844e91f3a29209ee

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