Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26d1349f67d5c19…

MALICIOUS

PDF

144.4 KB Created: 2021-08-01 10:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10ab63ee50e4ba6a215554f1755f6a1d SHA-1: e187210ad4ce2e1bea60c3c151ec5f296e21bc39 SHA-256: a26d1349f67d5c196ad00f56c8d89833d7f5968df7d5c80c807d2b40ae3f6ff5
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link farm attack pattern. No scripts were extracted, limiting the analysis to the URL-based redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://philabc.ru/uplcv?utm_term=who+is+your+sink+soulmate+in+ateez PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a251bb604da---24936363855.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1cdbbd188---23577636907.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/varisilesipesefo.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/levikurepobarosowagi.pdfIn PDF document text
    • http://soles2walk.cz/data/file/38380575030.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd1e34e86---kupikekiwexigotifu.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/16473686251.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/53f8c005bfe0678fe14ad185f1f62125/fewepewigo.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/97862997140.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d30cc6034e7---98174361427.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e58e4b82b02---25454947223.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/lubenuvibumesewuda.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/pupirujamejimejos.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/24362987704.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b247b9726dc3416dbcf0f9d6a02810d0/tumunobipinijasalod.pdfIn PDF document text
    • https://ei-hotel.com/free_images/files/gudivejilulepiputuwuwex.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/dbh2t8clh3oqd4i89450hvhrc1/nubilenonit.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/36363976952.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/larivunonanodipusowagaw.pdfIn PDF document text
    • https://alutat.com/data/file/mudoratosiseriziv.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/569306aa715dcbc4dd251b26460fe2a4/pinuwefuviga.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d1624a286dfca10f3410115e6657e3f9/31801210416.pdfIn PDF document text
    • 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_off0001d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D400 18048 bytes
SHA-256: c505b7e3e99ce61d29a24f678a1da91c9c1aba320b5940839134e72eb766b265
font_01_sfnt_off00020369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B80 10732 bytes
SHA-256: ce7295de46b4e505d9ba711c0fd23db8627bfc949a8383ade8434788578ad2fa