Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed1b376d4052144…

MALICIOUS

PDF

108.8 KB Created: 2021-07-05 06:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cbdb7115fa64d16fc587668f92f4a575 SHA-1: de37398c0dba3123c02369548dcb18fc67803985 SHA-256: bed1b376d4052144254cf4ba31e8afcc1dd67e0fb5caba6d307637591efbaece
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://datawire.gr/files/files/21037669594.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/3b4d6f5433490c3ef876b3151cc06d45/mururosositu.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/tavidakat.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb79ded6df---85253687558.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02d47f466---rexovunutiwifataxuwenadi.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62330345916.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a0186eea6d354c41635a39ff74307489/37752510134.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/fofuvo.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/dozuvin.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d37adebd3a35d60394f6ecac28d287b3/puwodulofamoreg.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/f9p6cerkp6fkaoln9nte8nqf3s/buwuzavopatalo.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/pivelanatakeweg.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5972fe48f8---sazixudefajatiwogoji.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/11a25cc5a965ac0bd029c87dd8730e4f/32582351100.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/fusamibitowob.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/980e61992cb81f1b7c15e771cfd110db/57916732533.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/450369002.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/sposj7o92c8uunnt30ii4b7kp2/jolikelepepekoxe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/q5vp3058gtkc3sge15tmnqced5/84765918443.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf41c548f---33888563455.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/89300303829.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9df22e6fe4e699de8ae13859a75ad45a/kuxejexisefak.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/jivedipotoxona.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6acb782afb9818581483a30c0e3120fc/kagosixu.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/sejozefibive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=examples+of+mastery+learning+in+the+classroomPDF 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_off00014407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1E 11128 bytes
SHA-256: 00528e9aacdf88438698cd4b8d8f06f25070ea834db4be5f52d424f61ef17e0b
font_02_sfnt_off000175f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F6 17580 bytes
SHA-256: 7970da7ea9f9e258101afc1463f139fe1907a37d75e2d9d919d3e6a1f0e07272