Malicious PDF — malware analysis report

Static analysis result for SHA-256 359dee751e0da17b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 13:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba2416217e0e616cf4560de8e0f9a72a SHA-1: e9f8e5fe93bba4086c3b55b17af55932a9e155b6 SHA-256: 359dee751e0da17b1d40a787a80709d5a333462b3b32da926ecf69ea50f99ebb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Furthermore, the file exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely serving as a distribution point for further malicious payloads or phishing content. The presence of embedded JavaScript and the link farm structure strongly suggest an intent to compromise the user's system or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drisraadentalcenter.com/userfiles/file/jukunubifuvedonamupusu.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4859c7f009---rigemiv.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/bivufufatiged.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ad206239---nudin.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db37b68663---denamiwotupew.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612d995eb1723---silogav.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/jexanaf.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/44256694963.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/63221092361.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/56774703483.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/k4srs4dg5ofddujt6fuip5r34b/83181838883.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/luxabufolujuzijejabojejuj.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3813940153---fagaborubiga.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/01a922f68de762969f0b546ce123088c/zegixexutokupovunobojose.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/f3206173b93185985855f60eb73fb9fa/91738582682.pdfIn PDF document text
    • http://atek-ent.com/upload/file/40107482958.pdfIn PDF document text
    • https://vzglavniki.net/data/file/89018329683.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161069ead9e6fa---70906843783.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/16169410935.pdfIn PDF document text
    • https://activepymes.com/pub/file/70917750628.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/gejufefuxonokafenagediwa.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/61444613561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=char+broil+commercial+infrared+manualPDF 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_off0000c1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C3 17472 bytes
SHA-256: 67ea08615426568517625fbf910c593baf2922cec314ebe2dfc60353281b6cc0
font_01_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 10744 bytes
SHA-256: 4e976719634692d4fb780f230a3329510c043c6e99b635de161e8d324f6e03ad

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