Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7e2fe64b023b5e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 07:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ae79e5b11f0e187b812a05a28bb5b51 SHA-1: f07c707605a8e18ab78960504010ef1628e005b2 SHA-256: ff7e2fe64b023b5ef6f6c8a93fb11cf0e011786c83de1e2b21dd627fff821d07
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host or redirect to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2eea0de85---47229872301.pdf In PDF document text
    • http://noahmission.org/dataroom/file/81774705418.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/19203032518.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/59442162904.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/dabitivukezemodus.pdfIn PDF document text
    • https://ratoempat.com/contents/files/falokijafumixoponubutija.pdfIn PDF document text
    • http://espicycooking.com/files/file///8975109774.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/87693934027.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/95586054495.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/22798083122.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/65605517356.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5cf02e58fe8dfa4a1ec66bb46fbcd05b/zumagegupagikaf.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/datupu.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/79273038212.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/gofoburupovevuz.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/jalafo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p9bdcchl0q3d049ftboomk3vi3/38206903509.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/gosevudopawowajusajakani.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/93351056914.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/86a77fhaete363l52asortgo19/xukagukuri.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/40864161326.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/vejaruzupuxir.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/joxuwixodonebujotupa.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/64776638930.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/87994180481.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/luderaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+iptv+app+for+chromebookPDF 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_off0000b9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AF 16252 bytes
SHA-256: 3f0476e3fae3ca00184140564906759563acf8540e98cfe4718d3406a43104b4
font_01_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 10948 bytes
SHA-256: 567480a1cc77777c65aefe83f839e23f6d47066cfbabefaedbb249d44a3fea15
font_02_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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