Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd15068de7d3907f…

MALICIOUS

PDF

78.6 KB Created: 2021-10-01 16:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dcdc5aa809c2254b634d03db7d815da9 SHA-1: 32af8de3f4690962e4cd8bbea99bdae68443f175 SHA-256: cd15068de7d3907fc0776612f521ac385c58c265dde7212eca2beb54e9891d85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains used for hosting malicious content. Heuristics indicate this PDF is a link farm, with some links directed to compromised CMS uploads and others on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://e-district.org/userfiles/file/vurezikitevuwoxakipukum.pdf In PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/13349757800.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/60794035539.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/94381332705.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/43575913918.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/logizatafixivoduravu.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/14768002529.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/ruboxula.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/63838403865.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146186f2e8cd---78757222308.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/26371387725.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458ef6dff7f---dawitowuxibade.pdfIn PDF document text
    • https://labelmarket.eu/data/file/sepogofumanebikajed.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/26517235787.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/musotagujatag.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/bavizepofugu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dazasegukigid.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/91964184480.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/68189726415.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/xasugefijubu.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/wigabumawoporug.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa868aace5cc95e7cbdae33aadda8656/nitejapifalajogale.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/lolunigavotilajabug.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/75585940230.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bakerirurupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hp+samsung+dengan+harga+4+jutaanPDF 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_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 16440 bytes
SHA-256: ab1d5dc3e26d6b4d3b21c5351f47528404b3e90de3baa9526bfe8effd0609096
font_02_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 10880 bytes
SHA-256: 02b240340be6850463daa1f66978eeaccdc5da53378137c35ab69ef63859a0a3

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