Malicious PDF — malware analysis report

Static analysis result for SHA-256 c971db14e961477b…

MALICIOUS

PDF

83.6 KB Created: 2021-07-18 10:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fdb09ed6a0bc4ab87f19a540045afbc SHA-1: 25df0d753f2a9c90afa3f445d7c13ea5c2597879 SHA-256: c971db14e961477b908a3d675e94d38136aa58f60346f4906e8fa6f2626ff947
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hoteldazegliotorino.com/userfiles/files/50904934998.pdf In PDF document text
    • http://aldo-ins.com/userfiles/file/73095695527.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/23347264722.pdfIn PDF document text
    • http://berbun.com/user_img/file/sufefogamomevovidoke.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c92bc980---xotodivejufusiruposixuwe.pdfIn PDF document text
    • http://gyobel.itpublic/file/72444263379.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tmcqahmqla447fa6dd4csrjn52/99528153190.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d0bb4e9258878de960a2bd8f7133534d/91472458864.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/wesekasu.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/vavesemunibaxutevidapuzi.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/9327126320.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c395dcccf9c---14005938253.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/kafokeliz.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3773b8817b---pedunoruwewipilivemeneti.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/veg6ei91ddfst152i4ttpnti65/mojewakibopaz.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/mupope.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43e7169af24a78d1bb810e8441899bf0/4546417073.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/sufetux.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1776130640---20889513374.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/49c8b8e705507f8ff5ff1d89e0677fb7/83316769685.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/71459420942.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/rf7g70i8poliosnc8rmaea9ob9/sagerax.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/fogejuganinibusi.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/23528765323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+clear+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_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 16612 bytes
SHA-256: c3cc2bd6c3d856804990049cae06a08fe914ea50011a9c7355d09106dcf66c2d
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 10328 bytes
SHA-256: 59f31d9b90db9a50a646c41a553a20ac94f2c2de6b24ce8af3e0480457de917f
font_02_sfnt_off00012830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1