Malicious PDF — malware analysis report

Static analysis result for SHA-256 e263fca4273c3f20…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 07:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa3736e61a1cb9f4bb6a30c97aeade52 SHA-1: 208f71cc2528a0404549bef8c818fba45673ee56 SHA-256: e263fca4273c3f207705a7bfa1fec255d504cc3e3eb1581406889f291896128b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple heuristic firings indicating it is a link farm pointing to potentially compromised websites. The ML classifier strongly suggests maliciousness. While no scripts were extracted, the presence of numerous external links, including one to algorithmically-generated URLs and others hosted on compromised CMS uploads, points to a phishing or credential harvesting attempt. The document body is heavily obfuscated and unreadable, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://gddfboiler.com/uploads/files/dokoributotijulu.pdf In PDF document text
    • https://safecampus.in/cmsCart/upload/file/jadirufukevojag.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/45602199420.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/sonaruv.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/94757059744.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/13404718920.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/6487327711.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/22524480586.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/13388463839.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/95529749175.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/82445402124.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7fa00a635ba37d38925b89b43261bcf5/funadedilotuvud.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d1c681fd---muxenofadedenipekif.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/5071829705.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/49184107990.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/wefaxakelumefixadilozozi.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/gabem.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/moref.pdfIn PDF document text
    • http://lgassociates.in/uploads/988440140.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/32440005042.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/momifuwuruvesi.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/41449225912.pdfIn PDF document text
    • http://taociren.com/upload/file/210906073248165751g2ytbbmm5pm0.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/71690421211.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d78df12fe---28684265028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+open+world+games+phonePDF link annotation
    • http://irodori.kir.jp/files/file/vazewamopuledil.pdfIn PDF document text
    • 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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 10884 bytes
SHA-256: 818303fa3e0e2b08fa7e9634ebeab635b487197d21cc836b12c21dcb0c5d4260
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 18104 bytes
SHA-256: 0283a61cdfeaaf55106d85524cd207fe6a5dca0f3121c276b18133e16060d008
font_02_sfnt_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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