Malicious PDF — malware analysis report

Static analysis result for SHA-256 de68e76a29630867…

MALICIOUS

PDF

82.2 KB Created: 2021-08-15 05:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6453622fc0a41b768e7c3f523c4a4a9f SHA-1: 74693c452a13bcfcda96bd386cef7e65cae395d6 SHA-256: de68e76a296308679deffca5c8176fcbcd55d482a25bf57789ae80b5bfec74e3
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites, including WordPress upload directories, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://visionbrindes.com/admin/fckeditor/userfiles/file/zuvabetixarop.pdf In PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c7ee191a74---97495330543.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/saguxisukodananufote.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/jibeteturigefid.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b2645f425---20808468520.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce397f8f2d2---vasujametam.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/gufapozetaxaragexe.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2283a12e---70872951552.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/81081134163.pdfIn PDF document text
    • https://starbox.fr/img/files/28303056376.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8ba8966a918415e94ce521800319c906/xawasijeli.pdfIn PDF document text
    • https://arerp.kr/data/file///20202665835.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/vijomag.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cea0ba44ec91bde1b3d4e6fd1182eeda/lajidekuwurix.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/85599020100.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3c4b938c9fa20562e17ebbcc5b3f1ae0/nonugosuzatarojuvot.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1df1f2aba560522014081d77a9dff725/gifizufefizizitizop.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591994c9c3---jutijuvefezuganugoni.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/26718015013.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/tuvapeso.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/d39qgrer4ecb5bkqf17s7702aq/zekejipozuvuroxokok.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/161048ce0762040eb87edd2d61f7d690/gugam.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/4042392646.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/gorukufojepujalotixelujo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/d3c2f48622613f576ca50aba19eba07a/35067888554.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/84685158673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=why+does+my+vacuum+has+no+suctionPDF 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_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 16388 bytes
SHA-256: 88b410f1b5f54f8e0a4f1100652bc8def5c8f7752da4195cff86667189bc8ea9
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 10760 bytes
SHA-256: 288569457a6eccb0701bcbf3951be4ead74d7b3d94526172dab9eea6f175c085

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