Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae780f6bea5f971…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 03:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 31a44ac140820ae1ca8092aa86e94114 SHA-1: e704a3f85f264c9001d911cafb96de045f8db655 SHA-256: 8ae780f6bea5f9717f8d34856936df0945d2bdb01e3417be39db493214a514a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristic firings indicate the PDF is part of a link farm, with several URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://juraganmonyet.com/contents/files/31039284097.pdf In PDF document text
    • http://sksound.com/userfiles/file/robog.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/91557338363.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/82543537023.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/janutokusulibefezuvuk.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/gonaxap.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/57781645982.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m43s3bfrm8pm4b9h88cd3979d4/33421405998.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a0b304925282056265255c6b35ebd410/2462997972.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/jolakifagu.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/mebojafiborovuvevivoras.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/57895600506.pdfIn PDF document text
    • https://motoralbini.it/files/file/1409315957.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145284ee1695---damani.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614524335ec39---77992643268.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109031146368531.pdfIn PDF document text
    • http://creationart.hu/files/file/kobebupifigulexoxute.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/dubobibozexutitiri.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/zuzatevagusagajakafani.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86658004375.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xowisifo.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/xudazamabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=clash+of+clans+fake+appPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/refezobojoledipo.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_off0000bedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDD 10412 bytes
SHA-256: a3e6dd9cdbbdf89eb61d79e926beb37f8cc149f49c45aca387a6fd31a9649864
font_01_sfnt_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 17172 bytes
SHA-256: f9e83e4bb93911d3b87f4ef74eac7930d1f5d12416205e031b841f5bf54fc693
font_02_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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