Malicious PDF — malware analysis report

Static analysis result for SHA-256 847dbffff5a66d30…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 09:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2ded49bec61847e29b6e7a220cffc55 SHA-1: 596f39f3168a1da719f81f98aff29a46f240bf49 SHA-256: 847dbffff5a66d302cfc5f9cf1a2e9f0339cc5f2c3fc18d6d03975dc176df825
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://linkingpeople.info/userfiles/file/47959041012.pdf In PDF document text
    • http://paramountswimwear.com/userfiles/files/72341435908.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/raxuwesikil.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/87822635366.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0mui29vuikc0obo6ho2oh45ugs/46864278289.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2a8a3d6a4817e991ce85e5325e107109/29253026683.pdfIn PDF document text
    • http://maidichike.com/upload/files/15401989387.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/lujemukapoladipubizulex.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/guvobunazijifek.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613d125081842---dirifavuruzepusu.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/96633813838.pdfIn PDF document text
    • http://metzlerranch.com/userimages/38874457608.pdfIn PDF document text
    • http://airmon.hu/images/files/32670336258.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/63915968176.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6407944d5---27042422358.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/nurawegofinoloniz.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/93571634261.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/9344237671.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/kumewobimubakuwigolaw.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/gidegoxebolagodudoreno.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/xudofe.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/perowobibififinubawonugol.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/togurojesowonepekati.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/94481712902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=male+voice+changer+appPDF 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_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 18760 bytes
SHA-256: 1559a9179a3be9398fe77626d9343ba5e6de047863b8bf3b45abd60a4716f5c5
font_02_sfnt_off00012d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D43 10444 bytes
SHA-256: b9213f11d140b1972d44aa2750141c33081c8a6d71020bc7f90c4c26f348c840

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