Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8df0c82530db59…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 20:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 55a92475ed5dc174d71705d9ac771225 SHA-1: 6af72b0bfd522e849688f4b6fd530cea0443a561 SHA-256: 8d8df0c82530db592a4242fbffea70d51eddc718ff110a796db234de3365c2ab
184 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it's part of a link farm or phishing campaign. The presence of embedded JavaScript indicates an attempt to execute code, likely to download further malicious content or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sun-green.be/ckfinder/userfiles/files/gawazapanasul.pdf In PDF document text
    • http://brenno-tojestto.pl/userfiles/file/42560207945.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3022eff6f---jugetuvokomeb.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/molenetezijol.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/folevatozujifisotifekasig.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/16059290731.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd07a9e38---binasegoxikefeledikugune.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/52adc3cc2a5186b68a743c3cbb09e933/xulegekemebuxewetaros.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/42933833367.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6c137009---paginekomibawojamawu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609983d1bc9c7---wowojurilavidoroxudiso.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e11bfb6e07c---46731934275.pdfIn PDF document text
    • https://rezgame.com/calisma2/files/uploads/kebom.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4624e28992---nufefofufofojemewukuroxi.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/17232615824.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///73950744178.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/f4a3bressgpqotgosupa2l7tpq/sojajevadebalatu.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/96bvba3ltbgrc30g1nic50n7o1/mokefo.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/9191776754.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/zobeperakavewof.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079d0424ce0e---98552499657.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4cddde655e29e9a9b28db06716636a4f/86732092785.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/vegokuputozo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e47e41e4---62118849333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=plant+systematics+a+phylogenetic+approach+4th+edition+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 11260 bytes
SHA-256: 830504fc390894e291c96d64b281baa856a6f934e1fea15e5f5cfa7ccd614f1b
font_01_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 19560 bytes
SHA-256: 906421e150484a35b23ebad1138d4b105b25e2aab4bb8a3fb7f51886318cc39f
font_02_sfnt_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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