Malicious PDF — malware analysis report

Static analysis result for SHA-256 0218f9a535619cd5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 21:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87db149da3868ac8bf397d4c2f0e8c74 SHA-1: b0e56cbe15e13085273392522f8276230a4509fd SHA-256: 0218f9a535619cd55307de9a18d6efcf1c7938c8f2bc9b582c3d0d81f7e86686
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or credential harvesting attempt. The heuristics suggest it acts as a lure, potentially for MFA or one-time code harvesting, and employs a password-protected archive handoff to bypass gateway scanning. The numerous embedded URLs point to disposable hosting and compromised CMS uploads, likely serving as part of a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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=how+to+skip+email+verification+after+hard+reset PDF link annotation
    • http://kvbm.org/pds/userfiles/files/55728294900.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/098925246108be20bfa11e6ae95becf1/9091700106.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210908_20BECA7E0FC9DAF1.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/10410616192.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/josazepetesarewitu.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/94297535533.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/66876275709.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/vefusafagakibo.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109111338232295.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/55116909940.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135273680d3c---kifeletef.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/tuwanazi.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/vamikefekib.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/65369601062.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/81204693119.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/nozatulebuzakage.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137b76b40db2---77546225107.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/4583534335.pdfIn PDF document text
    • https://cubic.is/userfiles/file/74322333070.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/11025417695.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/dakasiputifugekafuge.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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 11120 bytes
SHA-256: ec69ab99f4f80b9390adfd14e8488dc0b9764ca1c2b31a55831923e21b14a395
font_02_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 17284 bytes
SHA-256: eeae59511be29441c9fb1d9a567ebc8d302814fce4ebde6be3d15c0d0ff273eb

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