Malicious PDF — malware analysis report

Static analysis result for SHA-256 183d5992f60f3bb8…

MALICIOUS

PDF

84.3 KB Created: 2021-08-29 23:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3dfb4080c629b18faf4f3eb2144d89d2 SHA-1: 6b00e9f0ad67588a4fd7d7ebc48b61a26d95e736 SHA-256: 183d5992f60f3bb866336088d71fbb7f459879d210ff376f98974a60e1ab2d8d
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/kdhdstm50ueldcskpcflut20ke/5309423601.pdf In PDF document text
    • https://pfollowers.com/ci/userfiles/files/kitote.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca57a8b6cd---24589079773.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/62456080834.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106142019.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/68889406882.pdfIn PDF document text
    • https://davaocarrental.com/images/file/zekujujuxafubazosu.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/85651385405.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/49520444567.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/28606084394.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e35b0a3cb39---60880150313.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/gorusalejaropoxuguw.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/77434304911.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/bfe3e49b8fce2b9064e9f282263c9202/63918466053.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cce2c38f---vuzomelelelizonemuviwuk.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082516cb9251---xusamaxuwulotupufapetola.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/949e4876b2f237b24e00cf3984da7730/menazepesuxisodapu.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/68783378952.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610e364b63b82---legokoj.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dbc55514---wezonuro.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a314445e16---jowarikin.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/38926707030.pdfIn PDF document text
    • http://saydersan.com/firma/files/xesix.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c092da40b---59235623521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=compound+sentence+showing+cause+and+effectPDF 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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 17224 bytes
SHA-256: 2020289b4ddbd243e551561661505d36894354adc1567457621bf850fab4a54f
font_01_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 11136 bytes
SHA-256: 2dbac6313f46f9b621975c15fef473a555803971f13e34049f11ff535eedf8e5
font_02_sfnt_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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