Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfd17cb6dfa0e8f…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 23:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d91c495048a22a871a70975e9f81b2e SHA-1: db3588d56d6620d5520cb06f679db5334a4500c6 SHA-256: fdfd17cb6dfa0e8f6dc4b6cce77e516a1a02eef12a9a7955f3adee0b443e92f4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bjbtrh.com/files/pic/file/bagijej.pdf
    • http://esoftland.com/userfiles/file/latawenipeloteritumofofu.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5669b097---30796050855.pdf
    • https://motelandratecuci.ro/userfiles/file/vokimidunigosedojukagewu.pdf
    • https://maturana.cl/upload/file/rutudazogikowarojazada.pdf
    • http://gorisum.net/fckeditor/upload_file/file/74455004777.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d0fc8764---35817431746.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b513a5160e---befas.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2dcfa330c---nalodulisusisufi.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5e61399e---62230522469.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tatarugejolunifu.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/qmnaq747jte9q7skgg0crs5eee/52727742043.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/175c45c08524404cdaa0ced6a055bf1a/35235931221.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/33392393026.pdf
    • http://diamond6ranch.com/userfiles/file/xepukebo.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e17a03a336---18424046032.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ccbeb02eae5692cf01963c68a6de288c/67433778648.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/786a90e5012b50c52ca4dd2e535508d6/67939873255.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/05b039020343dcd7fb24669e24d4d61c/86815318012.pdf
    • http://zovsh.com/Uploadfiles/files/782810223.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/nakafebowulakasedewu.pdf
    • http://kawoka.com/userfiles/file/99569995407.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=windyway+animal+rescue
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e593.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 16792 bytes
font_01_sfnt_off0000fda5.bin
eb9903f8ebab026854f7b0f71c7799c1eae10e5730af31d48b058d8b3c68c190
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 17008 bytes
font_02_sfnt_off00012978.bin
766bc72a576cae5ee4c396ef1fe9d33365d2b27291244942b4360059d6719b08
pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 10608 bytes