Malicious PDF — malware analysis report

Static analysis result for SHA-256 713617691ba8a601…

MALICIOUS

PDF

89.9 KB Created: 2021-06-30 00:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1197bcb1acc075795a73b7fd77a21331 SHA-1: 8cf1dfaea0e6670dea8c222624392c7bc234c3be SHA-256: 713617691ba8a601e3fd7b6fbc0681cf4e0c324b0c092473a421ed19833b5b2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicative of a link farm designed to host malicious content or phishing lures. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c8737bf6d99f4dcec4bc0e2f99faae06/9958106991.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6f4387624---58572301018.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kovekezapinomigu.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/d7eecb689f5c97bf243da3a7ab4c1acc/supolawumevuwomekover.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef029ce97---binumalonutapixurenij.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fbc74a919---jizupilegusosuviluben.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sekil.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/44183d2637383facf44011711c8b0f56/43735230777.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e414878bf---28758425045.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/ee34b40db29eafca0339e9ec9993b1f1/nodariwojime.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/29111668113.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/82406453072.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5r6oif0p4kusaneabogkbg63o4/muxokokabupotufuvupi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741cd6b9913---bitofipemes.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b52e68b54---84750165859.pdfIn PDF document text
    • http://allasclub.com/campannas/file/37966360880.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ebf1860aec658a10d44c8b07b077d16a/92036749294.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/cf69beae1daf3596f4352a1860ddd8cd/melegopawiji.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1gfdpelng6v4fps4af6du8qfl3/54367756764.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c5a1e42f7e61a3d4259e470cadca48cf/57180901713.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/35902750105.pdfIn PDF document text
    • http://rjt1.org/upload/files/ligukovimamumareso.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/6cmhnls2imo2vi5s0htorc9g2q/5628420615.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84356de60b---98502631475.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/hm705c9ql8l2oalfqda4filp3v/tominomisekuxajadadugoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=amitosis+cell+divisionPDF 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_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 10316 bytes
SHA-256: 55a57e9a9c1294422f53a0e8cd0c4b098e0acf5d11bedd1c20a5eb4aae11ab49
font_02_sfnt_off00012da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA6 17488 bytes
SHA-256: fdd01e05b15148d99472ca3ef02b1ec16681f09f415e25548a363cdba12219f4

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