Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3530ae68304d71e…

MALICIOUS

PDF

97.9 KB Created: 2021-07-05 17:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 82969d2cc8746243cc284782de4a1fc7 SHA-1: f2537810fc17646dd51549f1c81e47ffc48795a7 SHA-256: c3530ae68304d71e23fc52515f8794a5893acefa8bee20712a5dd858b9106315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to lure users into phishing or malware downloads. The presence of multiple external URIs and link farm characteristics strongly suggests a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://queure.ru/uplcv?utm_term=history+of+the+chickenpox+vaccine+toefl+answers PDF link annotation
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966644e786e---55992631215.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/dedodosadixujaperat.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a1b642cad---toxujefes.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/nenuzamopafewal.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d3c03f628---xudawamamot.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/49192406937.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/23132672304.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/joxodexumajawudobesi.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/befedunerizi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9cb5a813bc9114b29ffd13434fc9aa30/83353237054.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/61537865584.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/ragalifovesob.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606da791b425a---65369275072.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/99131213879.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1cc9e2617cde620ca14a30994d348cf0/49691730761.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d954a4bafd---5938540082.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8416c91---58925217149.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/98008319993.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/1513789908.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c166ca0053---62723629064.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d001e95c---julidiv.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216212233467863.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/lejopixibuvukagomukijuk.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/58392827958.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-06-23/images/files/pufowarebenedepuran.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9fa36950---60106054405.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/vazasogex.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/rewinitusorowitixo.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_off0001180b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 11028 bytes
SHA-256: fba80d0fec326b94d877e849205e0247c0e91fcdae20d5f34dd34206db1a620a
font_01_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 18476 bytes
SHA-256: 3c6391fe7879933b20b8e505121c68510b8be597fa6fe9b489c68c5d8660a1b7
font_02_sfnt_off00016194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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