Malicious PDF — malware analysis report

Static analysis result for SHA-256 17934e1efa21a879…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 01:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9fac4d19550a8647befe7635e8f989c7 SHA-1: 7e4a517b19c0fd18de5d11f638e0fa45fc108310 SHA-256: 17934e1efa21a8790e83b4fc671e661268b6990d678016a9390487131f8d6c61
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://oawebserver.com/piceditor/file/73660375067.pdf In PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/1c86133b45359cf2c516da449f9cbe3e/fazaxi.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/60822245829.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///nitovutomuzumadobezudivi.pdfIn PDF document text
    • https://posh.hr/files/16694154231.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dubuwudiva.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/38d619d8c906746c6180f159a3dabeeb/83851857296.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/xusefenamilozurejuni.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/68684284032.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/25108631017.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/94604381739.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f3dd19d549cd5985e4303e9cce4fe14f/sirajawivabagu.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/3582426033.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/kinalawijezefulave.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/95407090460.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/67855468635.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/xeruxamowonotavobu.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/bipamokudiku.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/lodejotibonenadoger.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/61015698483.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16132f77c9b4ec---82339907768.pdfIn PDF document text
    • https://actorconseil.com/files/file/wamorifejimub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bed+wars+hack+unlimited+moneyPDF 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_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 11080 bytes
SHA-256: 4f2e076f62ee0ade526384e23b2928a679171377ed30bbdf1db518e8be5c018b
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 18856 bytes
SHA-256: 865e79678d2d40516dacd3c62876bc5b754bfd27c904349388506b7e099b9861
font_02_sfnt_off0001341c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1