Malicious PDF — malware analysis report

Static analysis result for SHA-256 0604b83f96c7455c…

MALICIOUS

PDF

90.8 KB Created: 2021-08-31 09:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 85c60c702bbbaaeb2cd4f2546f71c747 SHA-1: 1ce7b921fe8c9e499b77fa6e410adf22df28c2a0 SHA-256: 0604b83f96c7455cda991ca29f06e838b4c32f88513a8a620f07e1c9147524e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.tecs4.com/intranet/ckfinder/userfiles/files/pekajomovalisigemelofeto.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ri770imm9gssc9t9nmjm3omad6/vonaselonigejafesefunov.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/najonegefewuxo.pdfIn PDF document text
    • http://franciscakeryandcatering.com/clients/61981/File/pevevi.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/madulovalidurafekaziju.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/lifuvopomavi.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/domedewuwewenajedaxuxif.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/danaparim.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/39290119568.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/055333d00e5054e5e8b3c4da2e11d4b3/kuxebomugelazanojevixajot.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b99f473bb4d8f2eab92a79a9ef12eeb4/waludawaxigakawozakaku.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610877175eb6c---dekapusipi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a931b6b6417---20900112321.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/6901056498.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/ripuzizigawetudona.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/nivisigu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098350ce9bba---bixivifelodexe.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090f19439230---38707370085.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/mhl3t0qqtus98o5j8bnun5u1jq/47096574923.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/dowunegiw.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/21326495837.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/medanufebivegawa.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/lesegimefuve.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/patajipodifutepafoguti.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/rigapakilorefaxeturomanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=numb+in+malayPDF 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_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 9980 bytes
SHA-256: 1ae530ca127c4eacb76282c994c15ce22aafdabe699de354f236867863d1a28e
font_01_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 20204 bytes
SHA-256: b9b78ef2e89284e284d951e8b0d1a5bd4a576c55361a298a076c8bb5ad9b67e0