Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde16d0e950b7f43…

MALICIOUS

PDF

103.5 KB Created: 2021-09-04 20:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfb664c837f1bd87847a4453744660b6 SHA-1: e96fe666598757a04b2e15979797aacb5feec207 SHA-256: bde16d0e950b7f431e112099ced885d66bedf355b88547c2f7fe5c72365d1c69
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are associated with compromised content or phishing lures. The presence of a 'download button' heuristic further suggests a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=medical+terminology+for+dummies+free+pdf PDF link annotation
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zutugi.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/7331584490.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/32779660970.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/xogoxenepuvexizafatomeb.pdfIn PDF document text
    • http://sciattella.net/images/file/23095581703.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/dafutuw.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/48026739792.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/ca285c38206959d39900fb6412c14ce3/wawoveg.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/91296234495.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/15582986593.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/62590212827.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/xafopibinunel.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/38445ae86bf4c5541c4ed8840cc18f4b/xupara.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081971862073---70501732525.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611073d25497a---15764347287.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/74276ed8aea02f7582b4a49cac620767/98280746735.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161238df18f502---kejirakasivisikezigemareg.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/68169303270.pdfIn PDF document text
    • http://absigorta.com/E/file/49375787667.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a41bc73415b87a14813703e4b7abb5d7/wogujaxokedebugosujemowif.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/zizexivemumunipozareba.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jujajorotedufuf.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/40809375213.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b096ccd8---65693102270.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103e2a08b6d3---57669428095.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_off00012ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC7 17812 bytes
SHA-256: 98f7f1c244215a77648c9f400f1671e9452707340e244bde8d37f84ab8c08723
font_01_sfnt_off00015da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA1 11172 bytes
SHA-256: abbf8d48d14bd34a7062d3fbd0832fc333f5d5ec8e2f9cd54793090e5b0162d4
font_02_sfnt_off0001778b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1778B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.