Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb13727fb0cbe531…

MALICIOUS

PDF

70.6 KB Created: 2021-06-06 08:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 279f895b3ec45009d0bbd77e532f1c03 SHA-1: 30fe61ee2daeb3efcf581f8d1a51667db55adc72 SHA-256: bb13727fb0cbe531c87b0d7b1199555361fb70df0c2468814501a78cae14a871
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm or phishing attempt. The document body, though partially garbled, appears to be a deceptive lure related to a common search query, likely intended to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=cuanto+equivale+150+gramos+de+azucar+glass+en+tazas PDF link annotation
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/92c9eeeb1ebf1d05583899f3c77d3ea2/rulatizebafofe.pdfIn PDF document text
    • https://bloomeng.com/uploads/duwisulonujazabofelelo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16087b49da6633---samepewepasake.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/muzef.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/fuean1cuojkf6nal5kfrnq12k4/perevubuvakurisem.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092fd43da9d1---bezokevexozozu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/78551478103.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afe27779ffa---zemezugeparunefoginiso.pdfIn PDF document text
    • http://ruresept.ru/files/file/jupujutizejavejesit.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/22910383934.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd394a77b9---wujoginejen.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/673fe017282f48a18e34aaf3c11c323d/52819003873.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/83519020220.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/d09a4fa894b5014173594550be11b10c/58210924183.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6ri2kfuq0lsrv2hogjtmbv5rso/valubovomefipinomikit.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/96761414971.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vrd2e7ccb3ssfqi258lf90bfi7/58386883052.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 5716 bytes
SHA-256: 8c481e68e5f257906ef349898e72ad5888031a80620a031c629ff770d67a085b
font_01_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 12576 bytes
SHA-256: 9852545f18bd3d99c26f64551ef2f0e86c32aa3e917eb07c4ab4195eb01c24b5