Malicious PDF — malware analysis report

Static analysis result for SHA-256 4050e77115eb3146…

MALICIOUS

PDF

73.8 KB Created: 2021-08-06 02:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07f95e5bd2fcc433ec365ec94861e858 SHA-1: 0966621b4d58cb8dfb05502b860e0214dde1f65b SHA-256: 4050e77115eb3146b43b7c5f7228b614029975e74088b7bdd5592a283cb9caf9
96 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://texmet.pl/userimages/file/58050034066.pdf In PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/362369818.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d297f42a2a---jalefamusanimopara.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qnc3d0spmcpfnd01k1ffavc5qp/rabugumuzewigasude.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/sezurogadebatiw.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2309d97da817752e8bfc11c67df81788/zenojuzakewupovajevanofa.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d33b8dad---7166241623.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/durizowukezebidot.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/dezufebogevurizomesuk.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/60872704770.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/87072296300.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ad524fd29af9126a15477999d14e4458/judixilag.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/nulekotabewe.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/58645917418.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/87114394929.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jabofufe.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c3f9e3cca04e54343f1f1ae99859a30e/68151676760.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/87555823706.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/29435226371.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a9062175---34509074378.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608269971d777---ruximolobemomibokaruzu.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/14305626425.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fd2aa67e4---xakakuj.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/bf738081ace377212514e30684033dce/buzukamemaboz.pdfIn PDF document text
    • http://51www.org/uploadfile/file/d5090dabe9748b2bb2a1b424d727f6dd.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+de+ciencias+naturales+para+tercero+de+primaria+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_off0000bece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 16176 bytes
SHA-256: 560639ff8ed5a2c962ff9b84afcd83658fb8378d42a1cfe781206d10e4af7d6b
font_02_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 10992 bytes
SHA-256: 70ac032b718d5bcfd1d57cb6d247ed97bfe0146d20c2fc7ac24988dabcbd48ac