Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb48e8c003e6a04b…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 08:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d2c71d2d14b6b530a2cafd5c94235d7 SHA-1: 6ce3c84059dbc06a315234dfe8b265b3b610487b SHA-256: cb48e8c003e6a04ba45218b6f3987bdd17adb19f36c70a40ff24e7503b555317
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The presence of these links suggests an attempt to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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 https://mygenius.ru/admin/ckfinder/userfiles/files/dabokadazedava.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac483092a---vobogunovogabujisapu.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/6236550180.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/37815705864.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2388156fe---tugufekumi.pdfIn PDF document text
    • https://fultoys.com/userfiles/65993488479.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/82797451191.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/zufafofapidave.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e842eef3ad---59725666575.pdfIn PDF document text
    • http://edallyshop.com/upload/files/jetitiw.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kolanotetugijorom.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/55791307689.pdfIn PDF document text
    • https://tsegypt.com/file/topativot.pdfIn PDF document text
    • http://newmob.it/userfiles/files/legoro.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f20652a4---gomotelil.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/43539665740.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/feguxewoxazis.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/xuwawamufowevogemagofa.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/vevageziporo.pdfIn PDF document text
    • http://gensugroup.com/upload/files/dupuv.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16132367b21271---36304657318.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/biwutibotobusunexajesa.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/3637950219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=a+clockwork+orange+pdf+downloadPDF 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_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 10596 bytes
SHA-256: c10fc100f596c7fa7bd44fbaee24773b40858d0feec6411628b3795b13143df6
font_01_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 18240 bytes
SHA-256: 27e41854d9b6b1ae94516aa19c509ee7e1ed9fe891e0156351647a56dc62be77
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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