Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1c0e54356f365e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 03:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: adf94e6561cbfc2370e4d49b9ed9ce16 SHA-1: 98a8885278ee7d97fb9b7576a44278de2fba21fc SHA-256: fc1c0e54356f365eea25ecb27050233e39307755bb0d960fdd2b91015964efaf
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to obscure malicious URLs. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thesecurityguardunion.ca/userfiles/files/ladufojitamowivotugoseje.pdf In PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ofc8lu7ljlt1d8mvpfr1sn0fp5/dawulivijotemegidagim.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/460354934.pdfIn PDF document text
    • http://bakoca.hu/files/file/poziwuketojewujel.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f56d525683---jimazinet.pdfIn PDF document text
    • http://0930actress.com/files/files/jazegijel.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630355868_70c0262c9d.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/37388481350.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/womasidesofajubegow.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/lobasekaze.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8337ed02e7---72493141687.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9311f1201---zoruselurewaralimotixufi.pdfIn PDF document text
    • http://kasargod.net/uploads/file/soburusupofelo.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/39399317174.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/rofexos.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210717122233.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/selawetubebejinanadusox.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/56e2f487c42a9ed05f03eee398274882/pupuvopazadawizodagag.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb8aac992---11790153133.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2812c2701---pulabuxarupok.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da9f0ad1e13---61978457588.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/xilamovimopagev.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/446b24f601c6d125df0e54e0c7e6aa37/76673367887.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f7f90dfd3ee7d73bf22ce28e01517be2/99317257714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=casio+oceanus+ocw-s100-1ajf+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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 19256 bytes
SHA-256: c53e1cae42ce37fbf2f839b589591c99b67e098096b4e2640855d611cba35dea
font_01_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 10852 bytes
SHA-256: b17752bc9254c95ea0acb6537877f0b413e5d41c9f1fbf1f8301222e9945e138
font_02_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1