Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2792cce66a5c75…

MALICIOUS

PDF

70.9 KB Created: 2021-09-08 06:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16293019be19cf3274a14e284a503b86 SHA-1: facf5dba47a3afaf31e51bebc9cb807d5c086ea2 SHA-256: 5e2792cce66a5c7535178bc2b106e6318364547a8f3163be36f9c57f2cb7b248
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The ML classifier strongly indicated maliciousness, and the presence of multiple links on disposable or compromised hosting supports this assessment. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160974191c7232---93771681762.pdf In PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8f9b8d345fcb20e963f984cb7f4d8875/fokuzusimarilosaz.pdfIn PDF document text
    • https://diphong.com/uploads/68978977099.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/19957006862.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/mofudokok.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/dusipeka.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/97142668214.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210621_d8b68.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866a058376e---xinodugisazenezakoku.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/vaxewaripij.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/59000536181.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1601350e7b55e6f2a0f8b9fb8a1921aa/pewezopojiporisoned.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/gimalaxavuruko.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/90684772657.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f62a263157cc334238c4a53fbd74077d/56158084181.pdfIn PDF document text
    • https://harom.ro/files/file/lizumuzowosafigusevan.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/bepisuk.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108281305322157.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c84685ad8---wubeba.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bdc62452e---donoti.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607feeb85d370---99291043854.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609db14f846eb---fanufede.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/66115243202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=optical+fiber+communication+notes+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_off0000b5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 15324 bytes
SHA-256: 335eb4e6d0756b1743007b8fc3c5311243fbca6e3cc733d5ce29ff18534bb635
font_02_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 11044 bytes
SHA-256: d8a4db83f530c7fc04874dee8c2171e7b39a74648e5ca7814463c66b0efd1b40