Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ac1990e181ee2c…

MALICIOUS

PDF

89.4 KB Created: 2021-09-02 14:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbaec6a62d11ad9cb0697c76aa8c362f SHA-1: b4b3335dd89b55e8b9c3edc6981776352556e39c SHA-256: 63ac1990e181ee2c05b2021ef9f2d6d9b4eda6e5fbcbea71d9ab51f8ce18562a
156 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 high likelihood of malicious intent. Multiple heuristics identified the PDF as a link farm, with many URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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 https://self-storage.sg/images/uploadedimages/file/mulojoxisul.pdf In PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lotapokunokigisujin.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/90529702491.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/jitiwijarutobarexebogazad.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/depixabaxebulo.pdfIn PDF document text
    • https://ebooksweb.net/files/file/46176367102.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/21105872212.pdfIn PDF document text
    • http://greenbrier101.com/userimages/42013727383.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab125fd94---dubujikozusiwib.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/05837d9282933d6d10b7d4018b3d46e2/11934664811.pdfIn PDF document text
    • http://enricobarraco.com/files/vivolurunuloborixokasoker.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/52011672958.pdfIn PDF document text
    • http://www.bash.cl/media/file/79715030236.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/87472976442.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607aadb1d8644---tivofimedikavoluxalojosa.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea886b9312---xivolekutagudalizajeleju.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/58632349603.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/dubejularuxewun.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/gigaz.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210706125546.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/41864739265.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa52e2bc06b---74717900036.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/wikejaje.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/65821784256.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/jutexi.pdfIn PDF document text
    • https://iohrp.org/f_files/files/wupezivudazago.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/vanq67v5a1nkaaqbbg7b5kgv62/gobutumazefig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bloom%27s+digital+taxonomy+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 21636 bytes
SHA-256: d068bb188c120d6ea5428cc1e28c36e9d74603533ace804d012ab8de22a2eff2
font_01_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_02_sfnt_off000125d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE9 10912 bytes
SHA-256: ba956d5ac2851a073afa0ff5d03383554871e80187cabab11781366d8235aa8c

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