Malicious PDF — malware analysis report

Static analysis result for SHA-256 323d32cc1c418de0…

MALICIOUS

PDF

87.7 KB Created: 2021-08-14 03:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8798f6df91d9f78c1c494441c6b0ecd SHA-1: 5a3c877ff5c9bda97eb2c16f203fc3f0e1351bcc SHA-256: 323d32cc1c418de0d57233ad1aaf3c63dc1d49b36754aeb1cccd51d215f8edce
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 content or redirecting users. Several heuristics indicate the PDF is part of a link farm hosted on compromised websites, suggesting an attempt to obscure the true malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://sharadsangam.org/UserFilesTwo/file/19838384848.pdf In PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fbd57d235703c140d291191b86b460e9/7590059184.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c4b6518e6f1e41cd4e75da827c32158e/79399825247.pdfIn PDF document text
    • http://vhktn.at/images/content/files/78037058782.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093daf8798ad---18523986444.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/avl7313acr7272rmnlb3isa2rh/xikolikizipumaxolovu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9c65f1d6---befotuzexefizetepugowivi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/46857c36ce205f4e56b6974eddf787ac/bodonelakezibasu.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/nezipagabapobe.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/bawomuzifematobupojagos.pdfIn PDF document text
    • http://simoncaulkin.com/images/80840977273.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/23049458014.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94f44c2b8d---fevolezuneromexedusin.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/mojusozugutibulito.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0c6993ee7---47864393670.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/6bcffe22b2e234fa513f613d340938c5/telakafiz.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/samowawipukuxonerid.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/63224182297.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1ab353bb75486391116e23f4aa2d924b/riratosedokor.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/bumakaki.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/pubowuketig.pdfIn PDF document text
    • https://media-get.com/userfiles/files/sabanekiza.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/64054559928.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xusuborimimowerowabutof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+can+i+edit+a+pdf+on+a+mac+for+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 17672 bytes
SHA-256: 3c4cb52a9698e754bff7e6573bc15b236574ed6925e6101fd01fa190fac9370e
font_02_sfnt_off00013700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13700 10644 bytes
SHA-256: 6fa6697aee559410e0b527df82a0cb7211418598f77366386daf70f536760f1e

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