Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0df20b3da9b9e8…

MALICIOUS

PDF

115.0 KB Created: 2021-08-08 07:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f39e720e30e6c63e2cbacc0cd2609e8f SHA-1: 3da7eb8d59b328d932a3586a1fa9a40345353a3e SHA-256: 2e0df20b3da9b9e860b178427bfd4b9d2ddefa8dc2f1f7cff5094a75075c8acb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://wastran.ru/uplcv?utm_term=el+verdadero+arte+de+echar+las+cartas+pdf PDF link annotation
    • https://kamarkosong.com/contents//files/towus.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d9a204655---64486475306.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3ee52bc917f8a515b1b367a8e70057d1/nimukegenupovufow.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/fezozovibesosuvam.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/19219463327.pdfIn PDF document text
    • http://halaljones.com/uploads/files/sanekikegadoxoruwede.pdfIn PDF document text
    • https://agatanorek.com/files/file/95779081109.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pc2dhej9tosesb5it6f52l73n5/sojazarukenozuwusopatozuj.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ssidlfu8jlcnvosg9kamfn9mtj/lofavexofusoxewesijifitat.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/44723745609.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/susuvazuxadojijazureko.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/16dfc9c7194acf7e143746e339826f5c/72562799034.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70faca3eb---33541703127.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/waxuvudi.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/wenekometerutulefizaru.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3464192389---12761470395.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/rafeno.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/88l9ecahet9h6rlgf80o4ap4t1/30247676926.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/84346570107.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/17781049105.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081100e268a3---ramugemefexudemokigedine.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/55decc633b10f1534eb824c70df6da44/zuxigoxirovenuropur.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e23a3144d---38390667834.pdfIn PDF document text
    • http://someteme.com/archivos/_20210630024750.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_off00015b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B11 10572 bytes
SHA-256: f8f3e79c6a5ed4387ec541a0d9b6803e8c1316f99197e270221adc3f8ceb6302
font_01_sfnt_off00017357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17357 18844 bytes
SHA-256: 95f2737b7bae098fe13ab79728f321468e2a0ea7c32c2da81fb0e20bc50a11fc
font_02_sfnt_off0001a34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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