Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5f8eca4a9c6409…

MALICIOUS

PDF

85.5 KB Created: 2021-08-27 16:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 579a879ea46bf1e1812e5926c8d98f54 SHA-1: c87e32b3ce9b77d5d941f61ca2b64225658b0ce9 SHA-256: 4d5f8eca4a9c6409ddad558910797fbee3e1bd198eb4a9286c58c00efe89ad11
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610542841b239---60824453078.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4f8dac46e1ec5a6ae9e367111d7d7369/dipebatamukose.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/pewevipow.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074111cd4cff---15984761909.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/temodenam.pdfIn PDF document text
    • https://tdfstore.it/file/nimidupebopu.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/64460095354.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804d1cebc46---wukezamolibefudotoket.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14c39964a---81677232890.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/zaxome.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160866912a5b43---98496098893.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a96399f371b---77513092684.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/62563469292.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/betokuwusajagoxujiravoki.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d32743c80d8---91504464050.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/39018597664.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/nimadede.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/bagixig.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d934cb6b72e---xodutamidiwexedux.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210816044824.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/53266393920.pdfIn PDF document text
    • https://angkalaris.com/contents//files/gejofakewojewaredorevuf.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad490e83c---sasofugoxasudafodibimalin.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/75787053173.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/84731538970.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2uatcm5i7qrnhusj2aehkjh8g7/suxik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rrb+ntpc+number+system+questionsPDF 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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 10872 bytes
SHA-256: 15b8014fbdf09fbd0a83fb6d2aca0bc7095484c94cc7d3094f4adc514f096999
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 19532 bytes
SHA-256: 8672558299e2f6e2de644cf494407af8a14b3e35ad2d763cb099286d9ccb67da
font_02_sfnt_off00012e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1