Malicious PDF — malware analysis report

Static analysis result for SHA-256 99194fcef2353b02…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 02:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 55fd465e6d277291f36fe0e65dde6774 SHA-1: 3d9b62f6a04eb5c4358870977e5bfa835c6ea7c6 SHA-256: 99194fcef2353b02c0ad2434d2cac5896da2ad7b7b65f614ff7a010cc605e828
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/329a64e00ba4b8f01db7285b8fdee8e2/12213139943.pdf In PDF document text
    • https://bwawarszawa.pl/upload/file/lisepetilexabadav.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/jikovonesufabaj.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611c9ed60f58b---magifolowi.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/88194287130.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210819121257.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f960824c426---92405791064.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/ruxaxekuxolazukugem.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/66949102209.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1363bf4e3c8dd3578344aaceaf8dac4e/lewafalilerejipemebugixej.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/96223171482.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/kunijamovuvazagosujakup.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfc355c2c0---duwufeva.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210824100353.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/57312861772.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/96487624211.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/povafozeluvobigo.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/dopasumeb.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3cde2109---74020225240.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb7ae42ed---remijopopepag.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ada52c9607d---dajokasixosuregejaxo.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/segore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=taken+by+force+book+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_off0000b923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB923 16152 bytes
SHA-256: 4f3fbbf2b672f557ffa82f83851770d3c07e4384e04a122a5ec1f57cbcedd2ba
font_01_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 10516 bytes
SHA-256: 67fa0a66299ce5ab766763094994419c1e905cd819bb61a73f770db35d967fe1
font_02_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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