Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bb06d7949b2741…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 12:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68971f87976626950d9d4da283234e15 SHA-1: 52ea8370589f8de53b424ec11d33c4483979f634 SHA-256: a7bb06d7949b274154a902b5927eb78c2ce3686935fa3e768353cd1cdd51715b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or phishing content. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cameranichietsu.com/luutru/files/9380109003.pdf In PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/juxixujumupasiralolisugan.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/mujavov.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/sql2krbinqekrnvsnooj6op1s3/19651194382.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608358f94ae4b---dimawumebuxoruzivovefisi.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/54551785533.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/65b26e1b2b728d4789ce04694be959d6/dilazolomamitux.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ba7e28cca008da2ba010fcaaf2d6c89d/bimemitugigavikojoretin.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/65559786173.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f6222be0f736fe46fcb7978c5858f788/61094980068.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/60465688773.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609274ed31585---tukizoziki.pdfIn PDF document text
    • http://ge-mak.com/files/885238349.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/morowanetu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/32a4366a258f0f650dc80715f3e01cc8/10088650210.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/63143117626.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/3194338119.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/db2d40e7c1c025f440bd2e6df03c48e3/642358815.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/6534b1cf101430b43a20951a5f45d3f6/80065590327.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/ruwop.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/mezitefoxiximolipamuxi.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/fojetukili.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a723cb92f1e---rajijozela.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/29467674137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=create+fillable+pdf+appPDF 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_off0000c21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21D 16972 bytes
SHA-256: 520a0777bdc99782c55f537f85d848212a2d541f76fb1d6856839bf37a2b9460
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10268 bytes
SHA-256: 6735bced0cc0dac16886ee93b1e0a268fe50a5bccd4416aba53f0c8056fcd40c
font_02_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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