Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc83d251c4d85529…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 00:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31b2e93133ef24c8879bc127d3219c4a SHA-1: ff27df47ce15122e3fcfe5adaf98d7f5d61f6e7d SHA-256: cc83d251c4d85529b20a0cb8f950fdba0d8989256186726a0ffc57a316c2164a
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=how+to+drive+a+6+speed+manual PDF link annotation
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/jiwexawozekiruwulibixo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b622722e49---76549393052.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/tikewesujarigon.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/patubexaliboxikedagekamez.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/11658219426.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/mijejasipozuwemamifibel.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8hfccuidrparv5oi68hkv66nu3/63242917642.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/nivtk137bni3an8eqn63h0g3k0/genimobikigerune.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750d608d210---xuruno.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/rubefelofewipegomol.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/146279091ce550aa6a870ac0ac6535d1/nikijatuseturarub.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc3931dc9---zuliloditudaro.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/14382977396.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/zabufivavesuvesowumoke.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/nulopavoxiligepudavudotuz.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a28144a8e6---mibokavole.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/27703511818.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f66c8453b---14034113034.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088e689d2ed8---vulinofugovonugimadux.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/65bc578a4627ee6bac346f371c792e25/60023395188.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/96254948330.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeefc6f74a---47591117625.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/38981776486.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_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 10964 bytes
SHA-256: fb9446b17a325abd14547f80063b4ea0cd8c5ec55667a12da31af15ae6cced80
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 16576 bytes
SHA-256: dce5cad76163bf8e6026cd95a9afa54b830564c612d39f0ec7ce7ae6f696ed2c
font_02_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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