Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac44947a483d927…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 13:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9bfc72af9d27d30ae2967a79083610b4 SHA-1: 7ca044479db88a65e427c6b05557a0d447bd30d5 SHA-256: 9ac44947a483d9270496721bdb253ed87cbda90b39b043be2eadd2663cc5e03e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and linked URLs are indicative of a spearphishing attachment, likely leading to a compromised website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ba684ac2---82361114205.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b05582b7e7---2683133807.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503142505764564.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/367b8ed80bcf1734b9f33e20c9c2f71b/81950618834.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ldg5bb9r9815bap66jl4dshcji/23780887532.pdfIn PDF document text
    • http://thaide.org/userfiles/file/butagugodusigotuxosuko.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/58234880905.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9d637e29---kubujolagoneb.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/17836055313.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/3e1aeb9b7a38732aeb86023412afa29d/katavogabatogibuvusewitud.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7240cb408c230e745b44d848c1561953/pekuvujesoza.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/4l5ql7kpj1k304fg8gtpfs1s7u/revojasopewusufig.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a86240f66b---17921626715.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d2fbe4d8---fezisiloduviwaxajefefijed.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9pf8qtm6cmcvtgqi056aoju7f2/pagutofivujikazitogimo.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/mudipoxopowe.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/85906266777.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210616_E2E3C92186E683E8.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e63bdadc589cf72947c34b7757a2d8e5/70818433245.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/pofaregexisuzu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722b0f32186---duxuwakobakanibobenu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gabegagexitizubazo.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/43899863985.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/mobolodesewetonenok.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/luduxut.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081db4e94a31---bitikimanew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=salsa+verde+canned+tomatillosPDF 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_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 10672 bytes
SHA-256: bb2647f517106f4052684d0268aeec6537976aa0415707fe424c6e1f292cce21
font_01_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 17860 bytes
SHA-256: 189a47ecc73e10fa0d1456c1d9df3e75db66e5490c15be92d451df11433d7b04

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