Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ecd15ec6e90119…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 02:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 285287a9454e25f549fe734a15270a33 SHA-1: c3ce87bf842d30975c4a95df0ed548db72d3f0fb SHA-256: 71ecd15ec6e90119cbe52bf0c547d52370b2d57e979e593ca65f98ee2411676a
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=cinehub+apk+for+pc PDF link annotation
    • http://chrislahoda.ca/userfiles/file/7228106705.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/balowimugikatesiz.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/jumuwojol.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d4b6e3ea---newanexaduzozuvur.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/20070477676.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/xojegozanesiso.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/83185051721.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/16493630159.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/39609254846.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/guzim.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/49975704510.pdfIn PDF document text
    • http://grabnerestriche.at/75010399362.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/88956885b13de19e2983517bf6c8b8a7/6490029551.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/16550709154.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/61700310925.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/sirokufa.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/bulav.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161372be19d18c---90403767360.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/rapinerupuxodefid.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/lizivuxilemumos.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/35365372211.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/48694818513.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/norake.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zidawovuvom.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_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 19348 bytes
SHA-256: 36c2b47993eb03962f02b191e16d6137d9314a54fd0810ab8409412336fbdc11
font_02_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 10628 bytes
SHA-256: 518dd1eea3354fc251491961711bd0590d67fd5dcf328d5c05a30bea00c3f9a8

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