Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1952d09f2dd8355…

MALICIOUS

PDF

88.7 KB Created: 2021-09-03 14:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d1d571cc6ae6f8ae5a5ca1e2d6d1129 SHA-1: eb82cd2587a067102415483dfbb7a6ad6e4d0713 SHA-256: b1952d09f2dd8355456a4380c61fc440171cb769133cf8a3ea2b0677eaa26427
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for malicious redirects or to host further malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=petsafe+wireless+fence+manual PDF link annotation
    • https://raptiherbal.com/ckfinder/userfiles/files/pizapanefogufotexexod.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5ae9748463a4e04bd13d78585fc8c963/sasoruvodarigivosefikip.pdfIn PDF document text
    • https://petala.gr/userfiles/file/81737381353.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/jarigedaxatogorur.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c06170e8d9---40442712660.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070278acd367---pekelodipa.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc47c65a6---nazajifo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f131dc49a---xuguwogiseza.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/80111771862.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/e274d01d38c36635d92b987367a37d4a/kavoxejewug.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccdb94295---91385318645.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/67770126356.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076542dd4141---nafifep.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/lizitumid.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/kitukika.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/52281142463.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88532bd13---dumoselew.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/95529301195.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608932dc2abed---74949274566.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/jovikapulezuzerekewepe.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/jajulam.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a775a24e7a---7244197095.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/vakijepitupuduxi.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2c4e67393d0a324d64f8644eb894b566/nujalabokavuvexoxupu.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_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 18316 bytes
SHA-256: d782b1ecca341ecc2d233d5b117c8e8f50cc64d23d360bd0e568c3963d818ffe
font_01_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 10564 bytes
SHA-256: a4e6f625cbb33a38677a8d4280110848205dd37fec52f89c2b8e87b9b51277f8
font_02_sfnt_off00013d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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