Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c5262855b68c06…

MALICIOUS

PDF

102.2 KB Created: 2021-06-27 09:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b82e54f465282fc07658abc2ffd182a9 SHA-1: 73f68c7a89cfee9dd51fe7581723424dea525620 SHA-256: 24c5262855b68c06cd48a06a986889c6325bf0ee7497e93d0d1bfbc100d5194e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of these links and the overall structure strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://advantagelic.com/singhania/downloads/file/jazir.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c8868f24.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01a03d77a---panasowogorifajufujiwetuj.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/daxurexupamid.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/be91410226371f1cfaeeebd37ddc178c/82149221238.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hmiuu47pvr44j6ri2sk8vtejo0/suraloguxed.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/25033431130.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7d26b4f7672f6326fcdffcfeae7d6a5b/92972534614.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d8f336683a83349aeb7c581c78e2f3a/tufoxitakuronafenorulaf.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9d40e1d3ea3de517670dfc405610a52b/lipumurude.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804a1fc4fe8---visixupufebatavuwe.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/gejirikilotikimos.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/wivavulenolo.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/soduxosajenef.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/462b995c7633ba9a370784d6ac49dfa3/vanopajoximagugesimiraduf.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/38393f890adc9719109da753177d2824/26078243428.pdfIn PDF document text
    • http://attlas.center/userfiles/file/48405402975.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vulikuwuwuwakisilibebenip.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/robezomagogozupixap.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb33eb4432---94903853645.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/gekibogutazukux.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4ba6b52f---lenegezebudamixitozes.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/jolamamar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=monster+hunter+events+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 15992 bytes
SHA-256: adb970763d68595455e9274f0b36d2c4bcbf66a72c4c69f59cfb776fa16fb6d8
font_02_sfnt_off000146c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C1 10332 bytes
SHA-256: 725a38a74f8e67d39c516e580ef5dac9487671cbf0fc9ad464900b05afdb8ef0
font_03_sfnt_off00015e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E13 17276 bytes
SHA-256: 318842975be86f3d94a88cb646a9420e8e6edc207a040f2b0c6787ef3822d1fa

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