Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad305f0bef9ba03…

MALICIOUS

PDF

76.4 KB Created: 2021-07-25 12:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4576514c683e0a2c6f65d35bdcfb8270 SHA-1: a734b001676559d58165ce52cc7a2896fde0511d SHA-256: fad305f0bef9ba035d142588613e73774583c463cdb55c1f9ff2827cf5e6547b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites and disposable domains, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://castrolmintabolt.hu/images/upload/file/22147779.pdf In PDF document text
    • http://amctop.com/board_data/editor_img/file/202107032226.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb9423eae---jelezawagenamonujofi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4948ef203d8d5b5bb5f695f3805f73c7/keseludaxuzalokew.pdfIn PDF document text
    • http://kotolantopeni.cz/file/dozevipupedugam.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2f1012fbc2ba55df7f9380d2dea05a5/fifigibofelivuvewesokevep.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06622d1534---73724918819.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072516323779.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/4407378560.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/23324901651.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b65a4854---baxovuxori.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae7d5c122---31497069312.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/90896773458.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/pojumu.pdfIn PDF document text
    • https://asiajitu.com/contents//files/78316708269.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b122280027f---97958296883.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/40689586571.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce857b6ee24---navesafagom.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/vuwuwamijilu.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062322461073499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626816b31c---ramudebuwenewopefowefizid.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/salulubar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=imperative+verbs+worksheet+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 10948 bytes
SHA-256: 66d17ea9b3af1171175a97aa78506d8b33aeb310f9d9934f9da8169775ad64e2
font_02_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 16592 bytes
SHA-256: fa65a43dcf40be8e4ec3e951ae9e83f07cb70393d7c8251c7f437a5ae01c037d

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