Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e41fae6f7815da…

MALICIOUS

PDF

88.3 KB Created: 2021-06-25 00:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a43632e6d4fb898ad59efd1d8134e15 SHA-1: d849a56eef5a6f8bf0ae2c75d99b5b1796624bf5 SHA-256: f0e41fae6f7815daa89822ec2fad4d0e67cdf5df67956ca6c8cb8f9c43db258e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to compromised WordPress upload directories, suggesting it is used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure for a specific PDF download, likely to mask the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608637e7e84a1---niwokefe.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/pj86o6n2sl7dr1b94hfrb374bk/65754273468.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/4fd606837307653ebf1d5b447cb1715d/62242977525.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/vuzulozafinopo.pdf
    • https://tectrongim.com/uploads/files/koripine.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbad10af5b---favipijopuniwoz.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe3f968ae---74999549909.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16075f59097921---simisukanuviwubuxewolad.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/81659242015.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c314f724399---4392626138.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e78ce8e5b---musulokit.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/983a238e049f3e9ec6d78f83cbcf2ac4/remojulux.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cd381111---47472812501.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6fe74de5---vajixajejanetarafitetilo.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tobrqcrr670cpim6o99rkr4s55/7551013920.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608324f2369c7---78218837942.pdf
    • http://lbtech.kr/upfile/files/71309834158.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956943aa2cd---ruresopimuk.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77c08a875---jonoruzeloda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=indian+polity+laxmikanth+pdf+6th+edition
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df55.bin
0ec3fba83c5460b1bd9bd73877ce30d525b7e90b85d3483070647c73135a2edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 5332 bytes
font_01_sfnt_off0000f163.bin
489f1ec7f445519d6e100100d698b0889595ff80dbbbac0551f48ff781fe3307		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 2784 bytes
font_02_sfnt_off0000fcfa.bin
7ae24c565e85597844fd38f48c62d794103809f5ee36b127d1413849b666491c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 10832 bytes
font_03_sfnt_off000121ec.bin
e232d5b7127a726af849d750cd13ae59e3149fb88cb92944e6440980328b7188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 16652 bytes
font_04_sfnt_off00013835.bin
b5ff8e128bdf07b75da75e27b0ea6e604942094d267e54b75c51c5079b437920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 4960 bytes
font_05_sfnt_off00014a1f.bin
f27f1dab863be407bc80ce69f069aaa000ada345c50a5fba1d6b915b5f603bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1F 1736 bytes

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