Malicious PDF — malware analysis report

Static analysis result for SHA-256 f475b74bfc280d5e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 05:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 63c8cd6815a45042f0672f9f9a84dedc SHA-1: 89aa1ad64d2908b10c73cba7984cba4e7a3e3547 SHA-256: f475b74bfc280d5e9a7dd08eaefb08d49bde1627f6ded58f4582ac2d2bfc1213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the malicious intent of directing users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=the+400+blows+full+movie+english+subtitles PDF link annotation
    • http://byecook.com/ckupload/files/22609438600.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/6965420625.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/90393976225.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/776d3975d391f9540b526c5ff6277d6d/pufinanukek.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/44254695591.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/35388591053.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/pekabewibososavimoteza.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf92b7d45---wuxarix.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/zinepadewosef.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/zivelowafakefane.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/2563571837.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/lewovo.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/dubotoligasewodozikavaga.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109022352518288.pdfIn PDF document text
    • https://betsin.org/userfiles/files/tizepo.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/mefejixikojebomomezovod.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c182146189---32449772481.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/245c77f77368643692edd3cdceaceeb4/73633468192.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/dojilokero.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce725e039d0a25295f5b2e6ae96da9da/domoduluwonujomokajetedug.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0903431001630795055.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/rifumes.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_off0000d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 18728 bytes
SHA-256: d993682510bae1f1d3d373600c44f14a1cf4d8d5b740bb4f76faf46756973239
font_02_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 10956 bytes
SHA-256: 04143355bf8efbb28ad16deeb43ba49d5ef68775abec3ae8659c11554cecf0ee

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