Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f378c1c6d1d9ee…

MALICIOUS

PDF

78.9 KB Created: 2021-06-21 07:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 97eb3d8de1070b036dccf4e9833a22c8 SHA-1: a4aa3138360619bfa881520382f7a73dec394926 SHA-256: 18f378c1c6d1d9eed2d5d759d50d74b17c205dabdfb05575f282622b02363743
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the link farm pattern suggests an attempt to manipulate search engine results or distribute malicious payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/2bqf9732165vkn9q2v8fmpveia/3949212589.pdf In PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/sodedibusefozukoda.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6501ea65d06408b7c2b8e61628357530/63680618822.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870442dde3c---13237342059.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec6851a19---14351980006.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb0e7670f2---kafurofarawikuvezituxev.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/bilajexure.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8d8744ee---56205632925.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/25568972787.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56cfbd04db---gukepajarufen.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/7e36n75s7buhdt4g4svrsqgvvg/53883355358.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/42091612249.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c9cc70584---sidaruxolenag.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/k057levouve0paqm8epuevlse3/36926782014.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/9db5d795cf2c1e59ea483e1a78aee329/dirukez.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/57368608654.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/kaoe1th75fnik4f8vteqld6g6p/veram.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9046aa72be3dd473e34a4a5f2011c5a1/31666332456.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4440c791a3---19672159097.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/rezufamolelapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fideco+docking+station+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 2912 bytes
SHA-256: b3177c8de935bf2e05ba58035bb430970af2c83108b60a2dfb12b0772094c699
font_01_sfnt_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 5064 bytes
SHA-256: 797a68cbcfd0d2526ec5f4a468cc1dc4ea36e5e0ac3f6ca4ced5e011e1e72cbe
font_02_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 11436 bytes
SHA-256: 1f60eea2c26094bc579d62691d01b54090e1ece9a87867be3f5b0bc43bc0570d
font_03_sfnt_off00011f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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