Malicious PDF — malware analysis report

Static analysis result for SHA-256 045d30fbdd01c926…

MALICIOUS

PDF

82.3 KB Created: 2021-06-30 20:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dc7c5d7d77a16831aff8ce8eaca2688 SHA-1: e0deca537e062630ee01c2c4afafe75bce43173f SHA-256: 045d30fbdd01c9266e8e0d39b0d168de23bf05055145574a4e220026fa1c853c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites and potentially disposable hosting. The primary attack pattern involves directing users to external malicious links, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=n+acetylcysteine+contrast+induced+nephropathy
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4a9b8d62---29514711822.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ek8ni1v54lfmcn25o20h3d2n96/27322343140.pdf
    • https://catbasailing.com/upload/fck/file/13772128366.pdf
    • https://alakharia.com/public_html/userfiles/file/59277608693.pdf
    • http://designpavelzapletal.cz/files/file/zisometatagiveneko.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/301089b44a66652e128e52f477add81c/vurada.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/01db6b03c2b227f3a25ec54f43225290/vipadis.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa20b09efad---ronaxipafajofovugib.pdf
    • http://scro.ru/pic/file/41639461088.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797e1bdaf1d---12234365472.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/itmn70q14ab4tt8o5fql8digj1/7162871446.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/td4fa4imf5jkadup2i8do3lcs4/73152780203.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fecc6ed6a6---13171200852.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceec747724---jiwofuwun.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e3d8815a2---28335926222.pdf
    • https://annjulieskarpmo.com/userfiles/file/zojimid.pdf
    • https://szekszardportal.hu/userfiles/file/45827141281.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32cb529138---niboxipe.pdf
    • http://georgekoldun.com/var/upload/file/61141182986.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e33c6930bf---91007324946.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160767fe3c0e75---12157486435.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1e67a79c---gatilotigomupupubosujaret.pdf
    • http://energo-market.ru/sadm_files/pisanovilopogikewetaso.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160761225d1597---lotosopa.pdf
    • https://alarrabnews.com/images/content/content/file/wupujobiledagoroziveluxi.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/fbbdf9b584a769ecea73fcdb28de8206/kuvabiserukanugigafalifu.pdf
    • http://alnadaoil.com/userfiles/file/14977654159.pdf
    • 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_off0000dde9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 16792 bytes
font_01_sfnt_off0000f600.bin
a115e610dd223dcf5377c1d5e5054b701103a486479de76020f12a534ad914c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 10804 bytes
font_02_sfnt_off00010ed6.bin
7a32b132de5a49daba1ca95a00de98478869137647771a50497d4dbc5e51e354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 17072 bytes

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