Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3c2a334673e420…

MALICIOUS

PDF

82.4 KB Created: 2021-08-03 12:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 28deb07dd45c8745b35a8fc85f2d598e SHA-1: 34c30bc4ae85318015afbdb41c05c817b1dbf103 SHA-256: 6f3c2a334673e420d136dfc3cd31f1606d30790ac441335163516a575d60657f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, many of which host other PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt or access a password-protected archive, a common tactic for evading initial security scans. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100f72114f3e---zunupuk.pdf In PDF document text
    • http://congtydaihai.com/upload/files/betiwakalefanurirewirep.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6c2bdc7b---98324201924.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/3d4d1e4b422d4aa1bfd1f13600907fc7/wajirinidosabi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc450ca75---sovoduvumexivavesag.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162723583314.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/gekiwadevuvamivuz.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/579cf38725907774ba4d3229f3fe9a73/fapijawuj.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210720_990D9ED84614133C.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc67a1340---fopusudodufowuji.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/saxemanimetone.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcaaf1df23---mudajugezopiw.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/zukixaxobefoze.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/borarumivof.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qiutivldc9n162h4l9nac4tuus/vonotix.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8954t6a8vf2bsh4g80t1hlbu1m/63786395725.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/19711994483.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/jegekotigegimave.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7b8cf064---dutivosituximeregeku.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/aqpoic1268pikpkfl4m1pe80lh/69535845913.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efeef899d3d---pakenil.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed8ebd3a9---zetodazapodonekas.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/19751021054.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/tetazuxasejixuxeleso.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/balodeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=chamberlain+liftmaster+professional+1%2F2+hp+manual+3265PDF 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_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 16852 bytes
SHA-256: 9cdb4989c0429b3724c1e45e1239b74789378f9065e27934baa03f7c250099c6
font_02_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 11576 bytes
SHA-256: dea08d18f3178f9aa4f1bb181b9cc0ae555240f0b76d6347709d48f2e38090cc