Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51e332b771ed0e3…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 22:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76fecbb91b7dd4c3feaa2eab476cf203 SHA-1: 37070eacf01446b4e9979034eda199f6e5b4e17a SHA-256: f51e332b771ed0e3ee0ce862c6e5285695a8b133a97feb481657d72549c3b386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=goals+and+objectives+in+life
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab5c3c6ed---dikurigovibajifewejoruge.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4254184d2ab45c7ac92bc23ba8bfb7bb/buzizanakezare.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0882a3a44---wijokimomupiburubadu.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cba839e117f---gegodogedezasupal.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/km3090vlq8f35fbpqip56s5cv4/mojetavopumaxereliwuso.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/eb04f7964db075c7033534d972c5da3b/nilonepudutaloxezuf.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3d067824---jijedurisojaxivugeviko.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ec42922d---rixonaz.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075d36927c96---38392087203.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/20ps19rgoh8hljad2qik3la1ac/zutoxopadunelu.pdf
    • https://communeouchamps.fr/userfiles/file/77568762253.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf63d18af---setezexomosilegugogiseza.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160826641d514d---jelonipedex.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075344555333.pdf
    • https://familienbilstrup.dk/userfiles/file/23785912338.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c655a9aa---31760907691.pdf
    • http://jyjwqj.com/uploadfile/file///2021062321454121.pdf
    • http://okulsanmalatya.com/imgup/file/nigerigesapelole.pdf
    • http://sgd42.ru/userfiles/file/puzodimagumirufi.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f60a8bfda---pazinixuziriwal.pdf
    • http://yilip.net/userData/board/file/9110969530.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec1c594a7---14300231115.pdf
    • https://sakkestadbil.no/userfiles/file/90376039027.pdf
    • http://meble-tk.pl/userfiles/file/26573632880.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ed5bd923ee73e1041e2832e0be91fb01/84171232702.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75d.bin
ef528074d8bdd134c1dd2c81beeadad3508761409c93d4774409e9c029677c4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 17004 bytes
font_01_sfnt_off000123ca.bin
91423ca52aae96b741a413975559ae401d1eb047cd0355946549c923ad6ba376		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 10744 bytes
font_02_sfnt_off00013ca1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA1 16792 bytes

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