Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82f2640756686c8…

MALICIOUS

PDF

75.5 KB Created: 2021-08-29 05:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1bd6675a730b8183ea12d49c955cdca8 SHA-1: c454d1f57fc024f69f1eab68d5d8ca7e504e9410 SHA-256: b82f2640756686c8a09a479ab83223c8104892f0d772623f41fda9b108dc8deb
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution vector. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of multiple external links and the nature of the heuristics suggest an attempt to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://metaglas.kr/userData/board/file/47569745454.pdf In PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/4891701398.pdfIn PDF document text
    • http://meta-min.com/files/86341559444.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/0m2rvlcm379r4v46n9u4cngq38/59489338633.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/xiwupawo.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8131a94989---65298487943.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gorotizekus.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612abf4f595e0---zenowajonewivaned.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ttdu0dkocfheadmlnt2mdp3gbm/985983763.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/52f3aa29158bc8f09cd9fa85fa43171d/wogex.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/nafozuvexebola.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/57770362638.pdfIn PDF document text
    • https://znalac.com/userfiles/file/jowosujenubefajemef.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/49474098287.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/nidetidibitijupitogalo.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/soworakezif.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/26be9bbf091204ff41501255524b281a/77785581094.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/vibofevoge.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/kfjpnb7ebi8554lp8cgpnq87mg/81515777781.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abdcdedf80b---93106334720.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/76233975062.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/sgat9eo2rfu6t301625r6nu5pa/molemiwivupemixupazaxobo.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/wutulipexebaxutonolivevok.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/46762930472.pdfIn PDF document text
    • https://bem-sa.com/img/file/33363798800.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/vekevez.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/56216625378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=second+axis+matlabPDF 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_off0000c5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D0 10748 bytes
SHA-256: c3bf6193ce8761d92f424df3192b4b43d27e6e48acb4e88bf04510caaf5218dd
font_01_sfnt_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 15924 bytes
SHA-256: 42b6ecdace50c7859f1535a547364772c70083e24513b07339b1a176289129a5
font_02_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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