Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4138f5abfb96e2…

MALICIOUS

PDF

85.6 KB Created: 2021-08-08 14:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 42014757b31b04dfa5093da4430c4c7b SHA-1: ed7d636b9064f4d12558bc4bd2c4f8a5c1668716 SHA-256: 7c4138f5abfb96e2c5bb6fe8f4d0757031b00c003acd2bdd1e095470c4c8b22d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=stratocaster+pickguard+template PDF link annotation
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/66a4397262d8a82b63380aca956d1d66/linutup.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085426e61aed---xanukaniwevima.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab6ed47b4---814174688.pdfIn PDF document text
    • http://allasclub.com/campannas/file/46025936092.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/90878288757.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/18490298047.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa29340789a---91657459276.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/1604074906.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/dawebemexobijudawozeri.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210623_75A70F9EE03E0C69.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/zutufizesiz.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/7556893168.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/61972102513.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfeaea47e5---kutek.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/vipufini.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ab97b3a18754d82ec3aa5fc58d618cf4/zigizivipabopaditu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a1e25f19---34242902924.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/nujixusigagovuzavuvejiwe.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/vojasubitenes.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c7gdl9sd5bosnjqq4hge4ckov2/dikejegavatelexogatozeg.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/vovutukalujomemiwesavixok.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5cbc220df7e9c67af7fdf4c7a99b812a/tijifege.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e09db145f1b---tufajozakifiburabu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa63aeea0c0---10090388539.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160970fd16fa9b---gozagabuva.pdfIn PDF document text
    • 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_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 17332 bytes
SHA-256: c344fb7dafbf807f709fe787f443474870b3f225c4a5f77757caa44dc29a36e5
font_01_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 11020 bytes
SHA-256: cbd2545ddb2fb4092c637eba646263a052bf5042ee17041581f5b483b2a343a4
font_02_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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