Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad6e52a180e3f73…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 15:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f21cf833969a6087d55ac438de021546 SHA-1: b9ef9eb070dd895ce196d4e373a546bf05b8a4c3 SHA-256: 3ad6e52a180e3f73093ff6de61facb7f041dcc1892dcdad4588ece41d1f40eb6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070627d82ca3---98020973043.pdf In PDF document text
    • https://amatnieks.com/pictures/image/muwazebemododanufekepakin.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/210384911.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k59lflie3geeq3ggtgb67dnfm4/zukenevodofat.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a312f05af6f---97402313975.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a649056340a---fivixix.pdfIn PDF document text
    • https://ikansambel.com/contents//files/dedazuxufujo.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/90446871332.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6a413vp70mk3ghdvnc9nt5uitp/ramulenakojigu.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/godumepelej.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/nurireluwiralu.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/nuwetafubura.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/pafeworafaxomoso.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/da663b7771605e1890d2c72f9e538e83/fimosowitulobebuvesawof.pdfIn PDF document text
    • https://il-gusto.com/images/file/fegefunajuxejivolugepig.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5lob278nm2g3d547nujj5vlqp1/99695313468.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7742ce6abc---87713508225.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f4859c62---53042434989.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/navelimedofidu.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/36830532611.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/81m8anqc93bqi7ss4si3eqnelp/vizomijed.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/9d366eea6a3597672722454d56a3725d/visej.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf971f9e9dd---danuzimedal.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a86c500ced---kefuweduzilevujamusufejas.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/29478692590.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/lijovowikagas.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/vozazor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=at+work+staffing+agencyPDF 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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 10736 bytes
SHA-256: 533ed24af385105b3538422f6ef00417a2a20de68ca9c6f8f8341d378173c910
font_01_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 16876 bytes
SHA-256: 7de3784bd752a558e2833f3d47bed11e1010d8f373fef568edfe6ec8c5a4fca4

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