Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd56b4c44a4aa7ae…

MALICIOUS

PDF

79.4 KB Created: 2021-08-30 11:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 438a71cc3f9b065ffc82c04da36a9ce0 SHA-1: fc430b876efe0cb3e4a968e98a840ef397588169 SHA-256: dd56b4c44a4aa7ae56616f4456db45cdcd646619723235b86eeab2325b29191c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of URLs, many pointing to disposable hosting or compromised CMS upload directories, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • 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 https://k-newsletter.com/ckupload/files/tidamaxenutelomel.pdf In PDF document text
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/tafikosaposufadofuvumaj.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7f74ec3eb---zofejadufubeziwotazotu.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/11417036645.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/64252078364.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9de1eadbb---novojavagivafozakipoworik.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b52e6c1ce4d---sesug.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/72693826455.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161146ed26b6b8---78545748399.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/gazubetexunidagizopesu.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/92735428427.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/71797199255.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/97qbcvonkvitcgeejnl66cvrpm/wefoxilosewat.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7a9044f45636a5dbe6c0dc43bded18a5/901967320.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/roxudavulajunalikugeza.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/66522366754.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/puluvapimomijagitozut.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/442f939fb76d9b4f78afa73df5b17de5/29821736510.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/nujurupofonawubaza.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/eaa2af2cbed15be526bac207a3cd1df8/43410190231.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c96f3934c15---64136093944.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/42286243192.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0f54bd55751bdaa45b83aa66a92085ee/samedunotodex.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/xineveragani.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/kc6r351kk6mqv22q2jp9cu5nm9/94036747976.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/vowubuxigenoguzemewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=inequality+in+global+communicationPDF 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_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 10756 bytes
SHA-256: 541365ece90da609f2076885db4c1050d2717ec2661b887cc3ce4fd2be5a30ec
font_01_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 16440 bytes
SHA-256: 149575c56c54d0e4916746b7f74a9f9b37324f71a3b80ddc5907dbe93fa71506
font_02_sfnt_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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