Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8742a7f827804d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 20:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dfa81880e162c2665c77d6712993e9a9 SHA-1: 8dca87d59376aa19f9b77c1fcd25045ecc1bc374 SHA-256: da8742a7f827804de140cbd56c4b0371158d3c668af8345570f1a7360b0c032e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised or disposable hosting. The document body is unreadable, but the overall structure and URL analysis suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=sites+to+watch+my+hero+academia PDF link annotation
    • https://lufty.cz/UserFiles/files/74559881559.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/zaxutejuvepusilatobusig.pdfIn PDF document text
    • http://meditopthailand.com/file/89376120185.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/falagezudigejefivewiruler.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/famajunu.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/22701445010.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/98381172218.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/bokovelupoke.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/xeripal.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/dofopamevipuvasotexew.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a19adef949---dewetazonisibade.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/1146888267.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/viwusubugub.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/xososaf.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d9431408---76359943082.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/zenoxelegowezowuwixi.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/39344186676.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/vevud.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/564e78d9c37f83d1f03dac4322b4eb44/xizovufewexupiterenasa.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/61456278479.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/sojawotokavabewowo.pdfIn PDF document text
    • https://brakos.it/file/7861700622.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/rumapefofasigikuf.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/80112781350.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/bodexevapomomunilotijogez.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/46471340047.pdfIn PDF document text
    • http://tayles.com/uploaded/maxiki.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_off0000cfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 10760 bytes
SHA-256: b963cd38e370816e549d0dc8353468cd84fa92842629bf0689e67a79208df131
font_02_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 18552 bytes
SHA-256: d8a954f785dcbffd5e54ba45b818b680eabd7d550f81089a99c2198f3e35eac7

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