Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa690a0a0e76e048…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 06:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dd114dfe7f17038095820c758859650 SHA-1: 9924760deb34f921603b3c2f89dc0b5684eb6052 SHA-256: fa690a0a0e76e048baf804607cfc987006785be1d2b1e96391f873b50f415a7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs and link farm heuristics indicate an attempt to redirect users to malicious sites.

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://giaodantanthaison.com/Images_upload/files/21309335145.pdf In PDF document text
    • http://delannahotel.com/user_img/file/kevotagevop.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160981fd14b022---89735513931.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/fovemi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/g431kbe3vs6mj453t4emekg69u/tofatoxuzijeribefogiw.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5fec798bf---52809464864.pdfIn PDF document text
    • http://hodori247.com/uploads/files/wudufafawewilovez.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/43387000639.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a2718e4249e8ecdcff6f5c146c8d5897/8914876021.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/simitumuniguxu.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/zanis.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/susabenetogatu.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/16krgmfq16phnn43g539sob6r5/61131589675.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-8-14/20210814030111198208.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/veajcmh45umvstfu6kvgc6fsg7/66415934817.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/65493233517.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/nubeguwazerenepatixiwebut.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592e14ae8b---vonuguvizetabebividezufo.pdfIn PDF document text
    • http://zzquansu.cn/d/files/85698146189.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/sujem.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/jusuzexefupuzenudiwuvove.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/21199922665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=diva+cup+user+guide+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_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 17968 bytes
SHA-256: 5b9c0904f39a33bd278e7b3d708fd26fd49621414e1e5db75b13f86a32fb431b
font_02_sfnt_off00012fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FED 10592 bytes
SHA-256: 093344b8ef8e62e12bb6e2ac02dcd23ece640b13ddd50fa1262b7f5277d47ff0

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