Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf32c0c7f04384c0…

MALICIOUS

PDF

93.6 KB Created: 2021-09-23 01:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a794a8f42e772d527d867d4a732988cd SHA-1: 0729982b7b259b69b3587ee92070ccc1dbd7231f SHA-256: cf32c0c7f04384c00f599ff4272fc2e149e795e59879aeb38106e54b8b167d97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with multiple URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e7896bfbc283fdba1980a771bbff1e4/52385118733.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144cbca6f881---14608922809.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/vinajum.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9d896013c99c41b00758ff5b82d89a2c/54933961778.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/93547473376.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/mudaf.pdfIn PDF document text
    • http://annabarons.lv/files/files/86270963861.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/wazebevupexesuvunelim.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161361df13b9ef---27570691766.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/gomobanoxel.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/cfb2c2172356ac73c0187041c1bac29e/kimakigurudiva.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/10720510420.pdfIn PDF document text
    • http://eventechsite.com/files/files/xiduvomisotaziwajetomuja.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/selamixatovik.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e3623e5e0c6247cad2b59ee8f620124c/64862999117.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/noburavukiso.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/ranapiboralin.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/3041658534.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3efa824c593e246e9023de23f4f3d593/jisegologuvotepipurewesu.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/92613943327.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140abbc98e5d---fezesowenisubav.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d6beef18---11797829098.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/jetijivuxomoz.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b33641c60f265fd0a51a78f6ac9aa471/pagatenuxagafawigogam.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9e8c377d---83012650987.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/8431223936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=highest+population+in+which+countryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 10944 bytes
SHA-256: 57febb05a1b1ae6e565294cdc8e426e40a3131297ff211f884872ec71ad25a01
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 18272 bytes
SHA-256: 0cd6803eeb533fe3c6fa5a0584e41b4fed55100c19a890b2bcb8d040d8d055b5
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 18028 bytes
SHA-256: bfcc3ddb716559901c9c04f5e863e3082c8507c16abe84a85d12ecf91ab5e95b
font_03_sfnt_off00015033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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