Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9aef25307ac3a8…

MALICIOUS

PDF

100.6 KB Created: 2021-08-24 13:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 832619bb8f808ca54bf0e2f87540f288 SHA-1: 3b99155f4a6d26376ff75d3c917480e6100717cc SHA-256: 0e9aef25307ac3a8e5dbf00a4914a73248c2736b504555f30020196bdd6d619e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating a link farm and a lure for a password-protected archive, suggesting a phishing or malware delivery attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, but the presence of a download button lure and numerous links to potentially compromised WordPress sites points to a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160994cda6b706---merisiruvewatumupijawuxul.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/q76e8s8l20m9460g4hpm0ktl56/59170311956.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/fikimevedurelojavutosuvob.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/damisiwodunavusoxasasaxit.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830e28889a---3371393659.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/punalikes.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b49981b2---korefagagujojo.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/rufomapota.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/giuk11o4sokboim8a5lg8pg773/tujetajebiza.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/kidavinamarumol.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/27576479157.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/53878801367.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/21246054631.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a8b57e0c---71392666111.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gunujututugesiwazas.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2784d10cc---podeverezinom.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/66313018697.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082533475dcc---lulerewifumoxil.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/t2neb0desdd2dnt3bpoggu5fso/fufelunaxikegorivumeno.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/zeligebarowidudoborikumek.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60f2dd958---3318233847.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3da03768---bifizamezuvakew.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eac400b82---67709877435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=30+mb+ppsspp+gamesPDF 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_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 10372 bytes
SHA-256: d7ed44e359474ece4cf78f480660455668fbbdcbd109430650d09797b40244a4
font_02_sfnt_off00013be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE2 17240 bytes
SHA-256: 76e425dce8ff2e62be99447e1652d222ab69f37d352279f66add1f2338a9eacf
font_03_sfnt_off00015458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15458 17544 bytes
SHA-256: 9bae7e2624300ab8a6dfd345da54f7e287da4b92d06cfcfcca9714cd6634d13f

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