Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78c0735d54fdebd…

MALICIOUS

PDF

82.0 KB Created: 2021-08-24 19:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5026972f604e9d76ad139405d0001e69 SHA-1: dbd3f3d6cb6f89f72d4e8345e1c93b6393696c92 SHA-256: e78c0735d54fdebd7481736249d8bb3c4998e8799367fee1b7dc1dd872bf9e1c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8k0o6kjihc2e6rtqi7qtqi8tbp/nudinonave.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/da92c4a12d26d76a961aedbdd55980d6/pizinokafif.pdfIn PDF document text
    • http://dzbnf.com/upload/file///mokewuwejepefajavifufaj.pdfIn PDF document text
    • https://webmenuplus.com/images/file/10625887580.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/julotiragiwiza.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/zanolixavoxilivuvol.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/xixajotaj.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/6632044945.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/277cd88c296ef5116bb079a5ddb84a98/tilumepufiberiverekakubi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae546e6f773---54970936945.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0982881fc7---27784559804.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3ca1b12ad---kolaterijerejedimawube.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/96463319046.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/xunazupapazizidu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116780a6ac3e---64473690518.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/7b3891ee2defa9bb7d1bcff947178ab4/wobujow.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/71437836210.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a76ee50084e1cae01a4af9aeb2da9c85/71894921163.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/47356136885.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k1581f9cmghbt3u8bv7un3v3n4/gumizometuvovepewaje.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/navotubafor.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/73173719509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=premiere+pro+export+individual+clips+from+timelinePDF 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_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 17000 bytes
SHA-256: d07f5cf75c835ff9b456d3c83be118d61d625af8912c4d458df8ca8e3d3d3868
font_01_sfnt_off0001076f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 11052 bytes
SHA-256: a56acce918aa9220e01bd55a3fbea87dea2f5c3ceb09fccc76fda59e0306ae7b

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