Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a6af6549555a50…

MALICIOUS

PDF

95.6 KB Created: 2021-09-05 09:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61b233503300d342c710e7b5643e3aec SHA-1: 4eb19c77d638a41ccffb6a0fae28d4b783ea3362 SHA-256: 61a6af6549555a50ac309e4bbd167cb1e97aa74bd24affdc98ec4672096e9510
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=functional+dependency+in+database+with+example+pdf PDF link annotation
    • http://clinivetmadonnadirosa.eu/userfiles/files/sonoxusututizil.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/tabuka.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/mvddgn8jpp31gn397f2e6q3id7/55785688608.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/86123235636.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609913d9d009b---dejeni.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/merozirudera.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/penixobodevu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607030a69a99c---litiromepiregovosurexu.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/7653311693.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/toxugizula.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f12aff1e78df52729014f1a3e87c5aa4/bipipumevimutaxovaka.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/66254397169.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/57295c884488eca8e641ac30b45a961e/romasavasired.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c74fd66d882ddc1888fc795986c04d53/44676004073.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16086c03b76ebe---nefemisesotu.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/nuzatasulogunedukaw.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/07808e264e79d56fe588340e250f3f31/91199488439.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e91577ad368---momisasunuxola.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/775b52280dea33a24a12b8eae69665d2/wuwarekinotekeziju.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d99889b68---69698891703.pdfIn PDF document text
    • http://sparkpro.lv/content/file/lawilosumoxakizi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adad23bdb72---79376878453.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_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 19152 bytes
SHA-256: 3abe466c7ca8f7d8386d3ba1419392f5acf154d77a6e447b3646f9fd4b547daf
font_01_sfnt_off00013df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001560b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1560B 11304 bytes
SHA-256: 41fdb2d516446280c83541c2dbd23e996b4c0d3ff83f72505d735afa2277023e

Open this report in the interactive analyzer, or submit your own file for analysis.