Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5afa0adf9640a8…

MALICIOUS

PDF

73.2 KB Created: 2021-09-08 08:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbf97aa623c7a7186a36e8fcfb9256fd SHA-1: 474872f1c6f61d2633f690472201a31a2eb22477 SHA-256: 0b5afa0adf9640a89fa8577226eff14ab42effbe3dd85e068ffad6ea3c2e0cea
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 distinct hosts, several of which appear to be compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f357ae07---jusujexem.pdf In PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/77855525815.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8116db23c---tefemijepa.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/7kqbv4sgi1ful4lb00vf3pokl3/zowadu.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/toxugikig.pdfIn PDF document text
    • https://2acontractor.it/images/file/59664323859.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/dawigifirireriwep.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/3132805890.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612be8c9d9a31---xedonasajudawerik.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/5233880138.pdfIn PDF document text
    • http://intersonik.eu/upload/files/lomaseriredawo.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/50062066788.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7abe9ef51---20395601869.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/45304816628.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e050452a---25099481313.pdfIn PDF document text
    • http://jfe.hk/userfiles/92699353057.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tmqcj5ulojcnguk3r6c2crhjpp/5015300867.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/37126318221.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/24266546234.pdfIn PDF document text
    • https://digireg.nz/upload/35013156658.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e481b6a5f4d---fovovup.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45cedb1c1f---60680666297.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/456ec684454cc45fea7c981130bcf2dc/28466108600.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/50513146168.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/kusijofuvejusorelonox.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/el8u6adat82sa8g3n9i8jdihf9/13486380166.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/funukamafogatakufupamag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=homotecia+ejercicios+de+secundaria+pdfPDF 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_off0000bc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC27 10956 bytes
SHA-256: 1ecc11cd974edf34dc7d205fb3a47a54a831575e71425ec52a4c61c0cb8bd3a0
font_01_sfnt_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 16616 bytes
SHA-256: 524ec547c5ff4ae8103283d3953d3f5aea8a3568ad23aaab80dc921d816442d6