Malicious PDF — malware analysis report

Static analysis result for SHA-256 f104843dcbf35e2e…

MALICIOUS

PDF

83.4 KB Created: 2021-08-25 15:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9508418b99da7e643aac2c67fcb90c2 SHA-1: a4afff4a65be515d95f60df43efdc8c14abb8153 SHA-256: f104843dcbf35e2e54b02708bb8f3ce1925c85caf763c9da235f8b77b20bb87d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of a link farm and a visual download button. The ML classifier and ClamAV detection strongly suggest malicious intent. The numerous extracted URLs point to various compromised websites and disposable hosting, likely serving as download locations for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://smidgel.ru/uplcv?utm_term=effect+of+ph+temperature+on+enzyme+activity PDF link annotation
    • http://piazzademarini3ge.com/userfiles/files/71062338163.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/wopunadejojanuwidine.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/30025710630.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/49916333939.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e72ee405---93354887542.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723b774fa66---94937697225.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/wapexilerake.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/tuvepulokimebux.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5fe030595---wetabakufaturol.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/52918894049.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/3749687560.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc4c64b4e---11313508450.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/dewejegerulibitojof.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/bitunezenekutiwewotemeni.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6pbm1deq50km8bttglcsfblna6/13258062229.pdfIn PDF document text
    • https://fuoriscena.eu/file/89893955779.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/pejoburomowezigidupoxokeg.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d49448d8fba---tivepomegabazurasal.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/gekupixowuzujopovumu.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/33679877907.pdfIn PDF document text
    • https://verner.lt/images/files/zusuvova.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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 16592 bytes
SHA-256: 2e5d43db8aaf9d60fbede17920978b4f2d3708fc1bd828efd777b3d2ff1c82e2
font_01_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 10852 bytes
SHA-256: f7a9da01ccd963fe0b193526a39627dba87bc393e631b2d6b2a45e731ac4bc18
font_02_sfnt_off00012778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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