Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd2f5415069df1f…

MALICIOUS

PDF

92.2 KB Created: 2021-09-11 15:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c062d335d305bf576428e7353cf37c3 SHA-1: e109b10e2223ed7909752ab0ba9f51d1ec3f2ce1 SHA-256: fdd2f5415069df1f43346b38a3d270ebf9d42b349117737001ddeb58513345df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious or deceptive websites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://medvor.ru/uplcv?utm_term=best+fps+game+offline PDF link annotation
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/61565krtslee09utpg9a5dmr60/firijesexez.pdfIn PDF document text
    • http://szcftz.com/upload/pesukinexita.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/17889459063.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/85631568879.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/77394628422.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/nivowidagudaripitisoja.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/xemizovapufedorarir.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/f2g4ms88uo6ahgugcqhrs96src/lugasizofiropogeri.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/32422058293.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/45946097933.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/resut.pdfIn PDF document text
    • https://harmony.im/userfiles/file/91229307719.pdfIn PDF document text
    • https://shibbirs.com/media/files/66028903924.pdfIn PDF document text
    • http://seto.cz/uploads/48423021830.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/15986000753.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/40d8dcbacfd0d59c00ba4f7b461dad81/likeseniranudulimosipe.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///21707181863.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/mirivifidumel.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/wotedanuzafisotaf.pdfIn PDF document text
    • https://trexanh.net/upload/files/79171895211.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613714cbb426e---92446218909.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/nonapilalumekog.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/pudemi.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/59929094406.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/36311942512.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/33832236070.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_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 17448 bytes
SHA-256: 12dde22e559da48746dff5294992d2cbf52ec9ad00d158f3d53ca4e2e7c5daee
font_01_sfnt_off0001326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A83 10652 bytes
SHA-256: 55d97732d903c14ab6b8fb55fb1d5835c029eddaa485accff6ffa1b751705d51