Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a7691cfaa1c2e7…

MALICIOUS

PDF

84.4 KB Created: 2021-07-03 02:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b41e9f9e222fa09937f509b08f711af SHA-1: 6cf14ca2f8b64d4c2bc8ea2c7b567ba69a1a7263 SHA-256: 78a7691cfaa1c2e71e189813733f0ff7adeb1054e337720053a47248ad5ab1aa
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of multiple external links and the overall structure strongly suggest the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=meaning+of+delimitation+in+research PDF link annotation
    • https://accuratesearch.com/userfiles/file/wovego.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970590408d9---88168546498.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/jifejumusebapiwin.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d06b5aa370e---49158618444.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4b6ed2afb7aaf75c346d572fb23294de/82729064607.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/lodoganefe.pdfIn PDF document text
    • https://noddy.nu/images/file/53467381571.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607242fdcee00---31626636426.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/fexefojofuwew.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c4695e0fcf774202edb3aa4ef0900083/70512409813.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/91291766835.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02b3c1799c---nikogagugovusiro.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/09tarqpuhc973igpuvp6h74l17/beriroxodagaweg.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/72209087390.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3285873db---wixulasevagi.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2597cdbe8d18ad60c4e0c6b5b0306967/65455544670.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/419fc6430e824a73a4e668e1f2740c27/vagedagugavewixeziveli.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/40983969952.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/xujew.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e9fc8f89---salukuzudobidewegebesetu.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/kewepulabapete.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/nazepibijinekepusoximeta.pdfIn PDF document text
    • 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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10916 bytes
SHA-256: 92997548a9eb94a989a2bf9f2e17ae14c342b86d162d5eb184773a0d04124cf4
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 16876 bytes
SHA-256: f632a4fc87773fdcb519dfeb11624a80c18b86a4e7168d7a994fc81d4022b960

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