Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bde68e12bc4e23…

MALICIOUS

PDF

86.8 KB Created: 2021-08-01 19:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5e4c3e7f66e3343d98277f880069b562 SHA-1: fb196e532156d2bac7f963872c44343ea28fa1ba SHA-256: 61bde68e12bc4e231377101b0699b65b5e548698114ea16ee458d31e97c3764a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links, including those with UTM parameters, suggests an attempt to manipulate search engine results or distribute malicious content through a network of seemingly unrelated websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://onsijsselstein.nl/userfiles/files/16348830079.pdf In PDF document text
    • https://pharma-tools.eu/galeria/file/51389614398.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b2a2e550---kapapen.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/taxitijex.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac6c45448---12345158304.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/d8piucreiodt5lv5ohoccl2cat/buxugokabebugeb.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/73191436918.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/a4jqhgviq43sq8j87pfc66idf1/moderenaburomegunelenawe.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/61936122481.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f77e51d1943c17df22ebba900e266a39/bofabazexunusomute.pdfIn PDF document text
    • http://immopolignano.lu/images/6137664797.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/76539135968.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/40304604620.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vf5149m3kf1ff9mk5mjkmcqd8m/figadigipuxofub.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/16boi1jqssec5lhk1tuort32mk/wokevesepemokapifane.pdfIn PDF document text
    • http://hydrem.ru/images/file/77207735984.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b615da39da0a8a481012f8da10452183/piximomizumuz.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/10852197090.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ada2095d2d6---lopuwosozadut.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/giriwagidupexoko.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/d9ucq5km5e761os78fdnii1gb5/wupuwagi.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/sasudesoripasebisukibuzor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=9.s%C4%B1n%C4%B1f+kimya+bilimi+konu+anlat%C4%B1m%C4%B1+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e2e9805af---kiponedegerikajubijubaw.pdfIn PDF document text
    • 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_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 18800 bytes
SHA-256: fb6cc386a52ced753f6c965f9e55df2522250374c2da2da861c706d82d7d046f
font_01_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 11056 bytes
SHA-256: 37b8d3577fe48711b40f8733c30180c1df40ea4a5f627f2f48248b8dff31b549
font_02_sfnt_off00013252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1