Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0a5851a3acb36e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 04:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6b9e35abcb2b606c5acfb881b4f81e1 SHA-1: 6a615477cecd3955059cec319ebb680b1f63af79 SHA-256: 7f0a5851a3acb36ef30ac1fc9000276f5bcb2da3381c8b090a67c3fd988580f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous other PDF files hosted on various domains, several of which are identified as potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sz-nuoyi.com/Upload/file/2021090615072484772.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feaa20a48b---fibufopapotujisibonifi.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/pakujaduduvafenijigibub.pdfIn PDF document text
    • http://bscartridge.com/pic/fuxubemujunijodabufibofof.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3742820b3bb3bdc664204161809ab78a/luzafesozewe.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/wegubupe.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/85193192701.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/20821046909.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109081734493265.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/59568923153.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210916090637.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/64892525274.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/59822205724.pdfIn PDF document text
    • https://maviet.vn/upload/files/66017355577.pdfIn PDF document text
    • https://digireg.at/upload/64046089343.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dbg8tbt0gbjebtidk14fqj2492/31203087097.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/75589259724.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/41975762903.pdfIn PDF document text
    • http://boldogelet.hu/media/fimurarudezoz.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/97652918781.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/zuwotuximiwagovus.pdfIn PDF document text
    • http://asqcert.net/files/files/91338652979.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98c578221---davepipoda.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/13588140767.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/81084985921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=moto+x3m+bike+race+game+temple+run+androidPDF 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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 11288 bytes
SHA-256: 0ba3828ebd1f4e118daf500f80fd88bdb132fd25fd9fe7ce562b2778fd842c43
font_01_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 17144 bytes
SHA-256: 43c6469aa285a794599549e4633866ad798e69acfbd9b9198752591b156df90f
font_02_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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