Malicious PDF — malware analysis report

Static analysis result for SHA-256 44643ad78eaeabeb…

MALICIOUS

PDF

68.3 KB Created: 2021-09-19 02:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe774a744e3d19e21b69b8e9529aa048 SHA-1: 7843032d01232a37dcf96da66ad7e6c1239d174f SHA-256: 44643ad78eaeabeb25017e84a6ae049a8d89666743785b313ab3ca395ebfa07c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites through a link farm. The presence of multiple external links and the compromised CMS upload link heuristic support a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nigerseedindia.com/uploads/54872304365.pdf In PDF document text
    • http://avtosfera28.ru/userfiles/file/51829640597.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/91669611797.pdfIn PDF document text
    • http://machulski.com/public/file/feluxopimipofuj.pdfIn PDF document text
    • https://value.ae/userfiles/file/nenugixipivazuxalewolazoj.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/mawoso.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/rijuro.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/79354048360.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/pipopewu.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/70691615014.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/xawijixutezukan.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/93b13c8a4e1ca8e3a8abb7767c02200a/xatukutorajuvega.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/28664600177.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/lijorekifenekadave.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ofvvmu69d0gbj8pu9fhqd46rv4/numozal.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210909043347.pdfIn PDF document text
    • http://balalajka.nu/media/kebopelekuzozijatifizakiz.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/ladesevuropizamowinagemo.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/14708059082.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161461fa4af268---kavodijosewazepigurepal.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/89412122924.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/17427233470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+latest+version+2020+namePDF 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_off0000ae62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE62 10696 bytes
SHA-256: 8e44154916f2f40c4c0242b6e53a2736e15abd8c262bcb6eb23b4b0d970a9a3a
font_01_sfnt_off0000c6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 14544 bytes
SHA-256: 54619929d4c5444916e3cb6871816872135b35c103b037492171a659ded8f550