Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2380ea5c5d52e4…

MALICIOUS

PDF

90.7 KB Created: 2021-07-18 14:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a8e405539f4d6720d290ceeb7412c3c8 SHA-1: e37388651b86a450d39cdf63665c9cd51caf4586 SHA-256: 4f2380ea5c5d52e4f3502bfdc5af86cf6a9bba536b187ca712213f30400c4ea6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common technique for distributing malware or conducting phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate malicious intent. While no scripts were extracted, the document's structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • 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.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608837c9d09fe---wavusanazomulixupu.pdf In PDF document text
    • http://habitat3.eu/userfiles/files/jazujavuviji.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/63aa8e3467c51447df5c4beb358f2b0a/72880102325.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/efujjtjtf3aooqiimm0eii2l3i/kagujox.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84f80b563---lazunofuzurefimod.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/3853657444.pdfIn PDF document text
    • http://kfbi.ru/content/file/nokovipuza.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a424d323f75---35087052895.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/19017338781.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/85516006802.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/18f8cdf349ae70b1fe80ae369d1fd1cd/lanofod.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/21d988697c076b3e147337511168c421/susadamuwuzed.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/7t5nev0vsusd90s2b3k6300si0/kalamu.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/kisutanukowufudalikel.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/50267438516.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/9gtfs2ntm497a020gk28gnfc82/41442472055.pdfIn PDF document text
    • https://mfdesign.hu/files/file/88997755195.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/remugofiwino.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/14065798652.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/h431rq2ogeu44d8h66rbtlr663/sikiliziruwosavafoni.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/62c7431814f3846aa58ca7de28c6a2b2/70833307965.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/remavoduvuki.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45280c915---suxuvudabelavatokowume.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/b5dc51605f66e09d5d023d903c82a9f7/51988451905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=list+of+cities+in+nova+scotia+by+populationPDF 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_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 10752 bytes
SHA-256: 5893b553c5ec53168d7b3b2638d75709549db97c17b0fac75fc6b327f8ea8dd6
font_02_sfnt_off00012da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 18256 bytes
SHA-256: d753e8c3798fda9e29c9e85cf3ec8f6af1ce383f3b457b8e6ad96603f93c1ac2

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