Malicious PDF — malware analysis report

Static analysis result for SHA-256 d871b54d2cf1ce9e…

MALICIOUS

PDF

91.9 KB Created: 2021-07-31 03:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c593b34396ba7df10278d0f766416202 SHA-1: dd93f06df8876bfde149742eef2a46176d2ba891 SHA-256: d871b54d2cf1ce9e514bb43e60cbff5b8fd9bf6aee31bb7fbac9bca5b672a5a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links embedded within its structure, many of which point to compromised WordPress sites. These links are often disguised with search terms like 'the amazing spider man movie google docs', suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious content or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=the+amazing+spider+man+movie+google+docs PDF link annotation
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/gds81jhd9m0omkqlsoe3ijg5qm/zubilafapuxodiju.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/0vfbkj32p1v8af05aho5tdmgj3/78776573226.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4148a6ff07---44195061880.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda862f868---82642628423.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/59727186554.pdfIn PDF document text
    • https://ms01bet.net/contents//files/90453059691.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1805a03bd4aeb28f091d3056f5717a21/wajijobasizokevusawogi.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/48373891775.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/xoberamevutamofotadabef.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/lejawuzomegu.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/widekuxejakurovikavarit.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/13d20cc32a2048b2237dfbb1de4c8b8f/madobovujezudogeriw.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfe079de78---gavuxisidonulu.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/jqlqvdmq6e98bh2kggh3jqibrq/41612917248.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160826eea2eae5---xuvanakarokar.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4dac42de2---28477174159.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a056f7c5c1---36664751053.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/68700762322.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/12921338734.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/78353540011.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/kinawikobo.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/30716337458.pdfIn PDF document text
    • http://wamer.org/userfiles/file/47068771809.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 17772 bytes
SHA-256: 590860040ef3286cc174e6d21e5c27c0ca1571f085681bcf8ed2bc2a70d43dd5
font_01_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 10952 bytes
SHA-256: c2116067477036df58c0fa3e3b10932700752b8181c7463a5ac8a6d9f7c5c85b
font_02_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 17556 bytes
SHA-256: ae3592accf4aea79aaf57beff1599bf264bedd529252f5786b1e4c0d4263fb0a
font_03_sfnt_off000146bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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