Malicious PDF — malware analysis report

Static analysis result for SHA-256 919d331d55241100…

MALICIOUS

PDF

123.7 KB Created: 2021-09-01 07:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1fc206cfff54528478b50d8af7e0dba SHA-1: 330be6e44fb9530c5450639defb74d8ca053708b SHA-256: 919d331d552411008a9e0b73e2eddeffc41797d0a17536e95da3378e952e0f57
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/pjj32sdaep2n3n0li2lqhj1nma/731610599.pdf In PDF document text
    • https://tangente-mag.com/img/file/sopekuzole.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b2fd11ad372c83e610b8e8db15e1f96b/88906664191.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//14019455331.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c409b6521---dasikexuwuva.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f01611d903eec69cc60c32732863dd06/gudarusinaripajalo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115155d77e77---walugur.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/xareke.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/95bf81f7cba03ce6176cbe92deeceab0/6261995982.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/54520c7e9b1f11a0770c10d1df939d8d/25062429550.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/44880dfdcfe345ee6c6d8e75f570810b/55498479898.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jn37km6sdfaa2r5jo9o5e37953/mikuzozevi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2feec0ed6---gujizukalajinana.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/18fadbca67788280b40dc7121cbab73a/zazipavum.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/shspp0viud99mnvo3eq3flrvje/89999537978.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d43c3fcf3---15879886011.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d7134d66---gavedematawafasuw.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49e8d3f18---37630422199.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/34326967834.pdfIn PDF document text
    • http://393citizen.com/upload/files/jofitugenepatafiburip.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/01c6f33a54a0bec83b5f62c749a01db6/45838754188.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/sojutonaralo.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef41952fea---28424809183.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/tawove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=123+bollywood+movies+sitePDF 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_off0001786f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1786F 10696 bytes
SHA-256: caff9f82437b154eb89b1963e87bba701bd21444725bbc7f1ee1f9262144bd57
font_01_sfnt_off00019121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19121 21140 bytes
SHA-256: 1b9ab9a9698b3f87dbbbe243fcd461829d4f9ceb7fbdc28382bf7f473640b42e
font_02_sfnt_off0001c911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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