Malicious PDF — malware analysis report

Static analysis result for SHA-256 770aceb8f408ef02…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 19:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce9521d9721d972aebaa8511c9d5de54 SHA-1: 8db3d997aad14d999f91e16b193cda1f1da6b7b3 SHA-256: 770aceb8f408ef02282c112ae64fde27fe62296f86faf0bd3bf83ca66fa8595a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6134f432b25d9a940435496132f21da2/33443454405.pdf In PDF document text
    • http://rintoyo.com/userfiles/file/lugif.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/21025840040.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc53090817---41440370659.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/sozubupukakejerulazo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec673cd8e---20070866483.pdfIn PDF document text
    • https://value.ae/userfiles/file/23808799301.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb0df5b104---megefevaxokunot.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/pogakewavokirojepa.pdfIn PDF document text
    • http://cx-gl.hu/images/files/96475174257.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b2b7db64f8ace490d55ac8a605062f5/90559015491.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/raxomi.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/10263150152.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/fokukuselalu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/52552866328.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/gosedat.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/zimevegamufukoxatiwonux.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161414908e8678---80873662277.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/zilamedosadixaremakok.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/42206885868.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zigometemivonekad.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/94124199032.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/35311089916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=watch+night+court+full+episodesPDF 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_off0000bfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC1 17892 bytes
SHA-256: 1d0635e4b19f47f5f8894ce1e5c12d42c2d1fec246751ef5b089925c1b4e9703
font_01_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 10992 bytes
SHA-256: c7df233b47e6bdbccc15cade47a4b464a64c9d1e07866fec37d697198af23d48

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