Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac181cf00b17deed…

MALICIOUS

PDF

88.7 KB Created: 2021-09-07 16:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8fb6e2fdf4501b087b76680a6bfca090 SHA-1: 9c7b61328a2140868f73dec8ea7c6319d8f41792 SHA-256: ac181cf00b17deedb4db7a4d9c8f87adb23e6a9daf86c2e7e23fe93d8a002cc9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://kamarkosong.com/contents//files/raposafagekefulunujus.pdf In PDF document text
    • http://dailyxedayhang.com/userfiles/files/95067276826.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fdfc02b97---24084959470.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/kevirub.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/lodekupikowox.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9efb200d13---38038772681.pdfIn PDF document text
    • https://blv.by/upload/editor/files/43214893406.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/85991460366.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/61574721933.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7eb9dedae---93362033592.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/98042473233.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d36017126e---62539479223.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c435d50d3b4---69858183607.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/19655228158.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/31473601194.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d992ca117---87076481449.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f611a4c72ad---mekaze.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2f0c06084e4f884d3323339a80a9675a/41070842357.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/nodixefidajarobo.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/pijujuxuxotederuwofugix.pdfIn PDF document text
    • http://twilaw.com/files/files/dowexol.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c92439dbd96---sezodifugipavopanuzepukul.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829e432b6a9---foforufalipidoxafexo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2dbef034e187260eb86a0ddb2d4285eb/gikiwotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=minuet+in+g+minor+handel+pdfPDF 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_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 10872 bytes
SHA-256: f8e668813b939eeebd56fbc30df9f0befc1ba2ba9bd9535069266c93d19482a7
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 19016 bytes
SHA-256: ab2c5af219707657958b48fc67553984e5678346ed692fd2c4cc19e8060ca5a9
font_02_sfnt_off00013d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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