Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1f0e47179bac9d…

MALICIOUS

PDF

76.6 KB Created: 2021-07-19 10:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ece97051922085872f432d0804cca16f SHA-1: 9a1b5572c9a601185ff0c0f18bfd2d885032642b SHA-256: 5a1f0e47179bac9db39fbbe1b52f30591224f744c5885cfd6ddb2d9dee68a2ce
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be SEO manipulation or redirecting users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://skrabl.pl/www/rpbd/fck/file/fosuvefimedanejolevom.pdf
    • http://birnagarcollege.in/userfiles/file/51834994561.pdf
    • http://katyababash.com/images/uploads/file/kasadalasuratoxow.pdf
    • http://alimentosldm.com/userfiles/file/daxebemuvagudeben.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/21aa7be710f8d6b80b5a4bd00b71b851/61631693132.pdf
    • http://giftboxvietthuy.com/upload/ck/files/xowovi.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a200df7a8---gixuduzalamarasixoti.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609208bd745d6---70367275629.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/05lmkd2u1l267ofui5ecildatn/6963334524.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90308db26---15523211136.pdf
    • http://pawsandtiaras.com/ckfinder/userfiles/files/muxelimuxobu.pdf
    • https://psychologgia.pl/Upload/file/xawasenis.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a8ee68e0e---gusajun.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e04dcbd06---bikoper.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/39e92ae174d61649d5f0b4ca51762ecc/94354924748.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e0508fdad785dfcc6cec5638bb2e6d09/95181921273.pdf
    • https://coebmsf.com/userfiles/file/jagipixarevupewatowi.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/um9rcc0p0dqnjpm7l06n053432/96949713700.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da19c968ce0---97272867780.pdf
    • https://okinawa4d.com/contents//files/ruxilojomovixotelagoru.pdf
    • http://china-hold.com/UploadFile/file/20210605155955352.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e361887dd0b---43034235181.pdf
    • http://shield-in.com/userfiles/files/nowabog.pdf
    • http://asja-doll.ru/userfiles/file/jasibase.pdf
    • http://funperm.ru/content/file/goselobuzewosomubov.pdf
    • http://newo.ru/files/files/xoxeditaxabowuni.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tubby%27s+grand+river
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cabb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 16792 bytes
font_01_sfnt_off0000e2cd.bin
f1d65a52f4d3e53da81021e4cd1b407bb69d34ea0e2356641d12ccea1f57f832
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 16384 bytes
font_02_sfnt_off00010d47.bin
4add841ce2c21ffbaabe72c20316dadd385ea0a2f399994d9c48bc9c5f010952
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 10576 bytes