Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc4d5e1b4842b9a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 07:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67117df5df17ae0feff0e85dedf55190 SHA-1: 3f81c7e5b6e98e137d519d42ed92e0b9af7ab2f3 SHA-256: 7bc4d5e1b4842b9ab340b6c356d0fe75a327362d3192bc2653f45e83d794720d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of multiple links to external sites suggests an attempt to direct users to malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://g-shocktou.com/user_file/file/teguzibafoligupufomos.pdf In PDF document text
    • https://allmassage.net/upload/file/20210518111555.pdfIn PDF document text
    • https://campermagazine.tv/public/file/14557598682.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/n48ncuhrs8bskb5dg5v2gqb763/12032853723.pdfIn PDF document text
    • https://superpart.com/files/55097902283.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/xuvipuripixor.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/jalojodamubomigu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/16988143177.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/25462763930.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/81995067375.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/9910869808.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/36919275390.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/9kom12tdpic8bbhmovin1k7afp/jufukanuzixamijo.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c6c89c74f07ec1ea91cb4988c6d9f47a/94944390558.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/29860770074.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8a31367a57a7c5a1b274e01aa23699e0/mekito.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7ab40a68---42607346682.pdfIn PDF document text
    • https://t2sc.me/userfiles/17530798603.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4f72dce72a0c45a999b022327c65b620/leladuzogavomemanoveki.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/viximiketebadogerakoka.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2090f1e8---pirega.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/21760396605.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc69db77f8---tejomegejuzawak.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/gamesowoxewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=distracted+driving+facts+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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 17704 bytes
SHA-256: 415cac12437b2d4c01ca1c24a2390e1705975aeafcd53a6cd1aba15da18f7b4b
font_02_sfnt_off00012fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 10696 bytes
SHA-256: b9b3a71c086630486afc944bfe45c27e4a8d9bb39f6c8eff017cb309e4999648

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