Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bba90b1a61a5777…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 15:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e99867b41b85aeecd5fdb36deba761ef SHA-1: 50930f240d8f6cdd6fc2da35d843d69f1f7409e7 SHA-256: 4bba90b1a61a57775330225b12e566df8b4f12977eb6f0c2a651046a71275071
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=how+to+hide+track+view+app+in+android
    • https://mimpiindahsatu.com/contents/files/lipevalobitamaxuru.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161373a6903f9c---zawizun.pdf
    • http://ratchee.com/ckfinder/userfiles/files/23187512753.pdf
    • https://tidymoney.com/ckfinder/userfiles/files/92303138598.pdf
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/11311020398.pdf
    • http://bladensburg.abwingsmd.com/uploads/files/93073245892.pdf
    • http://saimiri.name/upload/file/vedadefetukudurok.pdf
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/bexibivogit.pdf
    • https://unosms.us/userfiles/file/gonadebaxidemenazaf.pdf
    • http://sadiqandsons.com/userfiles/files/garifinumupemet.pdf
    • https://cambodiadriverservice.com/userfiles/file/labixedafiwugadegipebigo.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/suwavoxifejikofij.pdf
    • http://stilna-ya.com/_userfiles/file/34857268239.pdf
    • https://cartolmania.it/file/zamedosasojuzapujigevube.pdf
    • http://studiotipaldo.com/userfiles/files/81391856192.pdf
    • http://domingo.hu/ckfinder/userfiles/files/barubepujuwepixodex.pdf
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/norozoxonifogakudomap.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/69456529897.pdf
    • http://evo-models.com/uploads/userfiles/files/bitaboxutuvuna.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613462be62415---60988438597.pdf
    • https://movie2book.com/userfiles/file/1911042623.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hfktqa091nlesid8p1n0h6ras2/fuberuxukabutekazipitamov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f023.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16792 bytes
font_01_sfnt_off0001083a.bin
dd41beef15bf08023ff0b69d0e687188ec5929689c761cec974cacb5e6b18349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 10632 bytes
font_02_sfnt_off0001207e.bin
27f43f1a31288133917feb7d2fb2df1cb47b5bc065f96d0f32ec797d37ced66b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 17684 bytes

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