Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe8074144d093c0…

MALICIOUS

PDF

93.8 KB Created: 2021-07-14 03:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 312567d211ef4177c7d76a17f47be9c4 SHA-1: 4214d5b01fe4fb5927689b1faebd2ee4a5570c03 SHA-256: cbe8074144d093c0b361cef921e1d00d4815ae307ef567f6754ada0cc80106e2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into downloading further malicious files by posing as an invoice or payment notification. While no scripts were directly extracted, the PDF structure and the presence of numerous external links indicate an attempt to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dharmapremipariwar.org/userfiles/file/dasosavobe.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fc119e9d361f11a2808f1bc9213a0ec7/nofog.pdfIn PDF document text
    • http://tulga.ru/editor/files/fitupuwo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/c2asee11k3r4j5b6v99iu8oocu/ritazunikigetad.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607039bd5b431---pewotofale.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/savulo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5860919697---93478336808.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1030dc1dad---nixunavuwezisiposaras.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c78d0c7c---sojisevavogukafuxoviz.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/22cbf264c74893aab551e813e89fbf11/piratipukuwaz.pdfIn PDF document text
    • http://wenxuezj.com/images/File/vadadifunulazujog.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609023b3e24b6---14217095442.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/getbqe8u7kq1v7oaa09mso8bu2/63102230762.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087209406e73---17657102853.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210611211107.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d074359873e---95006659222.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894db90f330---3665167877.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/16920635400.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5518f51c5c---85079819226.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/73733444343.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ef752161---widimimi.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/97932982010.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1618fc54---gidafajujuzexub.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/dd30092bacc1d1baf63a615afaf2d528/mozirulalaxivesewawusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+creation+in+c%23PDF 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_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 18052 bytes
SHA-256: 4173a52a71c6e83aa43c22e1b2feaeb4f4d1bdfca5652a679b517b629e93310f
font_01_sfnt_off00013aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BE 10256 bytes
SHA-256: 80c11e1a3c4b5b90115b508b85b07509d5e932171b2a4413393fe80dfe45f727

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