Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce1bfa6cf1d5184…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 06:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f98c65c29c71e58aa16f9df775a8d14e SHA-1: 9854f3eee7effd90e990f8f701e9aa870ed6116a SHA-256: cce1bfa6cf1d518495705e8fab9fcbdbf980f18c44e63cfe01bccb33839cdf66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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 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://bamfieldrental.com/userfiles/file/bamumako.pdf In PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lovigosufuwosamewolof.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/pimilerizo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7b0e2ea67---jetazoxunabulasut.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9fcea66f4b80436c7512a052fa86359/68665372804.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/h46uaf71krhpk1qi5l7ggmavii/tejugenivavuruj.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/mukuwokababonevenew.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/safewovirafexopoga.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/namewemiwosejewimomuloje.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/futazobo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/314b826be88798551a2f04db189664ac/22059952782.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/33e9a2471ae0fb61b5315e83ab145a44/modilulejume.pdfIn PDF document text
    • https://isleo.com/i_photos/file/batenolizekuzudefi.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/tigapofaguwo.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/rosemuzejegudejoju.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/16004624269.pdfIn PDF document text
    • http://fittbike.hu/files/file/68409525773.pdfIn PDF document text
    • http://heizler.hu/files/file/91703164789.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/62544737955.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/bomegugaxamexovi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/jidevigadakovakutejejoma.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/96517053526.pdfIn PDF document text
    • http://teifsepahan.com/files/file/79372711931.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/05a8fcaf5e3f291bf0e94f59d04064e0/4216508392.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/fepujumosumavonasirubu.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/norixodulimefetamuborip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=shin+splints+stretching+exercises+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_off0000bc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC40 15832 bytes
SHA-256: 63f1919ef241b530f69b727a63d0f47c38cd41f8aa21ebe2bc5c3de3282cf013
font_01_sfnt_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 10792 bytes
SHA-256: 65e223b3e688718b38e6702222801ba6b9825f191cafc40b966dc0a9ada1aa51