Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6447f87d367ef54…

MALICIOUS

PDF

98.9 KB Created: 2021-08-08 21:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 711f2f2f9ab1bf2424cb599105669a8a SHA-1: 458c7dcf140249381c93a170fbbaa9a2f9e7dfb6 SHA-256: c6447f87d367ef54e6362c5ef138e2c224fdaca2489f9e9cac401a674d6e0f2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of external URIs and link farms suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://catamma.ru/uplcv?utm_term=how+to+apply+the+7+hermetic+principles+pdf PDF link annotation
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608169b0f10bf---43843948549.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/2120778699.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/44858051440.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/86c98aa15178209de6a0ee6724624f52/23821763489.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2f0d0cd85b19bf555ac589a8d88c3cd7/36201039067.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/83772624891.pdfIn PDF document text
    • https://energooptima.hu/upload/File/bufazuwatazob.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40004b78d---movozagukala.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fef01b7ddb459dfc41a6d47649488d8d/gumemomutenop.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/660a37b377322adaf612e57c30169731/xedexogigogupiwafuti.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce44af56f---99452548122.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/712764bca06dc7831e46ffd9dc2a728f/woxap.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b385651f1---disibaxovor.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/kg1808vcu8dlamg9u15e28fsfe/xiniful.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f090cc855a---79010177404.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/72801254965.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/63130533850.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/72126112731.pdfIn PDF document text
    • http://fruitvita.com/files/files/goguxutixovipoxagikajul.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/70081dec63294be0e575427873cfb3e6/widakuze.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/firatijudofolodexotexenaj.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tanidizizazonuwenof.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/14406711596.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/f39b5538d146110708084575087ccaef/gijuxosuzuwawafozin.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_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 18916 bytes
SHA-256: 2f10f8d5535177fcd0c3d48de3a5fcbecccb91548fb1594fc916a3a01ec59ba7
font_01_sfnt_off00014983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14983 11124 bytes
SHA-256: c8446d22dcf34cdf846fbcaaddf92d4ee3cd60a3fbcb0f642a1ea5d1604f1f50
font_02_sfnt_off00016365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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