Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf108c0514e7364f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 06:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0ddc184dfe1b7027bae0d39314ebe35b SHA-1: ebdfbf779051d24d1d9436e7b72f54a643d68f80 SHA-256: bf108c0514e7364fde95fa3d0bae1696780dddd054fa9f8f19075bacae4649f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the heuristic firings point to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://xn--oy2b19v1mb1yi.com/userfiles/file/lugadegegu.pdf In PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/madutirigonemejed.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/47738943718.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/tojejunin.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/sotavepazutaloxakonotogor.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210910104520_1352374612.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/50329045747.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/1041236889.pdfIn PDF document text
    • http://seamacros.com/upload/file/96310798207.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/setamemepefiganomemena.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/wowigovaxata.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/wujototuwiwogewalomezes.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/guxazesubodugoluwuzizesu.pdfIn PDF document text
    • https://jotelek.hu/files/file/69209826966.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea945bd1ec---19905564645.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/f822d45255e4324b2e06dbee42911c42/rimufefopurod.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/14335825026.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614197c559b67---sumusumusugeto.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/gobovi.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/59464405979.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/77565177106.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/nafar.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090314073873499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=surgical+recall+9th+pdfPDF 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_off0000c393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC393 17808 bytes
SHA-256: c7396d92bc1a1ab2707f335f97d0f5a4d042678f51b8f884ede76a4d27a88b60
font_01_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 10848 bytes
SHA-256: f8e3fb9c5253b005fc170acaa617213dbd3510b0a84bf45c0672d9c867189571
font_02_sfnt_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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