Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b16b9cc84dbc4e…

MALICIOUS

PDF

83.9 KB Created: 2021-07-07 16:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 28c6c4eacc96288edeccb0272d5d04d6 SHA-1: eecf99a6f853f12380658e88a34f11baef68fc7f SHA-256: 67b16b9cc84dbc4e4a5624a9a56f4ac056c0860a2f51a687e84e96dc1dafe9da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=how+do+i+clean+throw+up+out+of+carpet PDF link annotation
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbea5fbf342---53865242512.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/bufegirukolataxatubu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca4e65e045---mowowe.pdfIn PDF document text
    • http://ipceurope.com/assets/file/16025495428.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4015a60889---tobopajigijubofe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hdrhpukmjq0uip53ukeovsqv7p/wozosi.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/rixovasagezexadisap.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/wegedexavojeturatefevidaf.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/pubazekezuburobibazilig.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1276481a92f158e4b0d49952231798a5/85011351049.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ds2l0lcjr5202imo986oi0ecb1/fezorizamofefulo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5a6e793ba3542845e2d7b44e2b572763/kijopepis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d054f59b72---71434035292.pdfIn PDF document text
    • http://splogservice.ru/content/file/wodoxozomamod.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/bebe3bc5962349280b4e50c63f45cf37/11373197229.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/jnv02vnqpvnnmeepmii3um1vvf/xesebedaw.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4c7hiti7bq5jaggst41hee7bn8/basaz.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xaxigonixosuxufupoba.pdfIn PDF document text
    • https://soechi.net/userfiles/file/76800343575.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/5e646f3883744e99ff32b946b62b8180/16608986140.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c975365dcff---wosabowufupovesewusizuxu.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/56723158052.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/76241704119.pdfIn PDF document text
    • http://akssert.com/userfiles/files/94910078500.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_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 16344 bytes
SHA-256: 9ae0b7a4eef5bbe1b9d666d21193a0558dfc4e056fc144d22b88fd79181c48b2
font_01_sfnt_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298C 10728 bytes
SHA-256: b9ed5f1b8eab13f09448abe7265411e4ce152ece5db651f4e24a164870251ba1

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