Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d6d180b4d94af8…

MALICIOUS

PDF

78.9 KB Created: 2021-07-26 07:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5a8e79162f0f9b4643db4f9c7c140557 SHA-1: eb54d113eb27ce35e030546fe8f9fccf89b7d4fd SHA-256: c7d6d180b4d94af89d9796b5cddeb1589f94e373ea758218b5233611fcd56486
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings clearly indicate the presence of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/2f2v2fg09l7ibe59mg44o89om6/vemobapupuninidewowetekib.pdf In PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/febetutitubaf.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/nopowirenut.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/suribosit.pdfIn PDF document text
    • http://falerisztika.hu/tmp/93933303797.pdfIn PDF document text
    • https://noddy.nu/images/file/ronuvesugalanitox.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/17191318dacb402e47f46c8d399ad728/99468296327.pdfIn PDF document text
    • http://blueyee.com/upload/file/2812531138.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/nanutul.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/44918798865.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f64d15a255---20136316471.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085d25f914f5---88426065295.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/25572237863.pdfIn PDF document text
    • https://areicon.com/images/file/mikuxizabidiwuzososawuju.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6e2a6ab7874181a1909b14d17da4b902/36529447730.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7a77cfd1ce844a93db41ff642e7bb317/89181478985.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607240c3a03c9---59112320751.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/tixorusow.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/83976057833.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/dikomenelaxavopujogumalif.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5d7a0350b---fetena.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/gibisafetiz.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/84706648693.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc37198af21---76881746889.pdfIn PDF document text
    • http://polkovnik.su/upload/file/95178457107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=new+remix+qawwali+mp3+downloadPDF 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_off0000d061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 10768 bytes
SHA-256: 7d284dc7512f37c9fc14e52a2f1706ec8156fd0d49a230365a08ce896466d13f
font_01_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 16992 bytes
SHA-256: 67b408febf72e46e9f27696c2f81b1e616d7b90b66a0ac1a95ebc10558cfb619

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