Malicious PDF — malware analysis report

Static analysis result for SHA-256 449b2f275ab835a8…

MALICIOUS

PDF

88.7 KB Created: 2021-08-21 03:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5971cac2724b077bba538e6e98a158f SHA-1: de9c658ecb35526cdb9b154aceb2cccafe50f86a SHA-256: 449b2f275ab835a817f3276b88696a4b3c2423ef77d7d5d4b4e2797667419bd0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as phishing and trojan activity. The presence of multiple links on potentially compromised domains suggests a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//39615323867.pdf In PDF document text
    • http://chretkinia.pl/userfiles/file/gamebojozekugijujozaxowan.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33734cb33---zelidomifepif.pdfIn PDF document text
    • http://elm3rad.com/file/kafemojatobobatidi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8a179f3a2d6bb220390faf26973bb2b1/ruxigidavilofaburamepuxix.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///18281163732.pdfIn PDF document text
    • https://migger.dk/userimages/file/81116349204.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160911da5c8917---sovogeba.pdfIn PDF document text
    • http://faradbox.pl/files/file/8644868988.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/23217771803.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e734c82da3c4d40aca784abbc6594ccc/jodotokivegiz.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/87216388585.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/24987570531.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccedbc68c44---vedanabawabikurenunex.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/72553a9c3b32f8bc4e4496865cda771a/wapavibesadim.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/sutadutome.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/kemuxuwadusevagesakos.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/60701369168.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-25/20210525211612893875.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/54019894440.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/61445824652.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/24973549292.pdfIn PDF document text
    • http://reclamesticker.nl/images/uploads/file/98933268277.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/sujux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=liz+in+september+full+movie+watch+online+free+english+subtitlesPDF 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_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 17248 bytes
SHA-256: 3d6aa587df43b5487a6afb331ebcaf466985fd59e3fa202c37b6f82ec8e813bf
font_01_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13753 11336 bytes
SHA-256: 2ee9ebc40246b9f43d2b92c946d424c90fc5e5f8eeab4e597790847d1336be7a

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