Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f21119446f096f7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 08:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e7050def9c068390e3d77a12cfcf27c SHA-1: 289ef123c9094c2c7138374621018102376a3ae9 SHA-256: 8f21119446f096f703b7a4236df3a7d9481c16a65641ff1ae032d030a56a3607
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mstreatmentadvances.com/userfiles/files/lufuwimidonibaw.pdf In PDF document text
    • http://www.asap-recruitment.net/upload/file/63508007040.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1ce7498f61ce96a01c1f70b90377f986/55796356925.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/gajilifozebulinovumuna.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8j4nusl3v9lpo1b21umpmoqdc4/denigitodisexipikawe.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/verilisitiwuginogikux.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210805131043_8lejnp.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905e2b7e59d---rigego.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/vasakudenenaretila.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/43527518314.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/lamefagejer.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/barefudimip.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0b029172c4ac3e1d22fdf1ab0652d1af/rafatamakazawibamekime.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16121175c9a373---narorofezilovekosenozob.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/dilojoreru.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/78502828408.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99275317251.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/88229017714.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4dd50d55---90740868435.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/48186583264.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c6019f574---rigujijo.pdfIn PDF document text
    • http://kisito.com/userfiles/file/40198711251.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160763adbea9e5---ruwizafagajelanubar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=algebra+1+parallel+and+perpendicular+lines+worksheet+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_off0000d0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 17964 bytes
SHA-256: b7847cc58247aa78de0204a1d29cac0d9cb202b52c30cbcb9c2252d2c3643678
font_01_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 11348 bytes
SHA-256: 99420570fb70998782a1a252b14b44416941ddfbefe3073c9a0b4162437c16e2

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