Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf72d94b9af7802c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 14:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12a33a63b153eed231ca0914b3980ec9 SHA-1: f5b6c66867b7066145cbd292b5a383b244e49669 SHA-256: bf72d94b9af7802c7616f656aa5ba8bed7535791725b3862909c97e1fffca5c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI findings and link farm heuristics supports the conclusion that this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=android+16+bird PDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996735ddf3---wuvavo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf16e64db2---gilogazodeb.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/93466556885.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/sobewos.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/jufodudujimiputefetosag.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/13582521274.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/68268983486.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/95419038075.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/vuxukunuxis.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323b06051a6---70465305643.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/9262686737.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/lidajekikaxinepepukomoga.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/71223338814.pdfIn PDF document text
    • http://imaginove.eu/data/Files/xodubujigerabokemujitiro.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/sugegas.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/vavufobuxiroburotuseno.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/zavuperanafepura.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/91012692831.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/musisimefipesukobaj.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/wonoduvuba.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/babaxeruropivipuxad.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/zalazuxetamifa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa15c5d07a---28817582917.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/57787681767.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/53101507792.pdfIn PDF document text
    • 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_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 16096 bytes
SHA-256: 2ef36fa11c1155d67663462ce1a32c6ad84574d1b45bde65f3ed36e6152e90b4
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 9976 bytes
SHA-256: ed8974eee9fd2ce708a6943aa574ae8756bff75fab6d64b27996f32a07cb1317
font_02_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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