Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e599d0d46cb4a6…

MALICIOUS

PDF

101.5 KB Created: 2021-07-08 04:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 03334adc94bd5fc064c0269bb3267a18 SHA-1: 3b2fbcfd1d33aaf0be8961e8311b6c3c96ae9d2a SHA-256: b5e599d0d46cb4a6c0c447251fb860a767b0daff1e9ab45811fd4e0e4737932d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbceac6b3---42729183824.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4097ae086---xidededojirusil.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/11465279590.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160894d79f4130---bunalofenajuw.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2ab0b22c873d728f16fe90b8d0a42d12/rokovi.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/783f241c513bcf1e882bbec2385041d1/xopariwotikapufube.pdfIn PDF document text
    • https://magerp.org/upload/files/69995389536.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080951957f15---josipilonobolebitetadotib.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5755a55utusb9oaufuljukfu02/tolobemisu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759b82180f5---fidobevumujevefuzew.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0e201ed4ad3562ee766f34aa09b486e0/53963877670.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/dobozekilamo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2087755b23---pakojomovututinome.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/79696379010.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077850f5c80d---gakup.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607315058f5ea---muvowomanunowaxevavoxa.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63a54b1a4---genoturudidezogijaju.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/14092296671.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/1806b7c60899da243791a45d444c8b38/50464840171.pdfIn PDF document text
    • http://xsteelstock.com/d/files/noxibofenikofagosutig.pdfIn PDF document text
    • http://cl-pub.com/files/files/33917867640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=brindle+chihuahua+terrier+mixPDF 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_off00012a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 10604 bytes
SHA-256: 611fbb3e7dd6326b7dada510d320ea22ddbe481ed8d46adc73bd8f62af022534
font_01_sfnt_off00014257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A69 17908 bytes
SHA-256: c1cd07a6727f1374a7f20d796b9c2b36dacd90a648fd2683088d31ebbb9cc855

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