Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadba652e3c0c8ca…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 11:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b7346f01871da61309818b99844f1bc SHA-1: 1b5fcd3019dd65987e64b64210197ccad315e267 SHA-256: cadba652e3c0c8ca580cf4e3ea5dd40ee834fe1bf2725b10e4729aaceb3059cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://edu-family72.ru/content/images/uploads/file/fuvod.pdf In PDF document text
    • https://ms01bet.com/contents//files/kobuvatajemujow.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5b1p2kn5bq2lkm6kdp9fogqjs0/22055475020.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/7170432225.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/sagixuvilogew.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160823f5613921---munozakew.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/525bbababe0800ef500c3d57e74b9458/ragamewelubajakomulane.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/l1u0vl6hq2gf7qkedpqt2k20kc/71585455851.pdfIn PDF document text
    • http://vodnik48.ru/content/file/nuxamanujupe.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/nowaduloniwipuwagenaguber.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4bf30ffbd52b330c38c1b619b34440f3/tekevor.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/zesozewizopajagi.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/26296366324.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609607663f680---93709138256.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/f099dac57f61c9bfc06d0a723179ead5/80226408687.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7393a1a10c704e4bbdb1872d740828ba/18571890026.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/62222187138.pdfIn PDF document text
    • https://famecosmica.it/file/34664965566.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/takaximizizuludovimig.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/10734436649.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210812174620_1x5o8t.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a821abda880---57240652300.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/varupon.pdfIn PDF document text
    • http://446888.top/userfiles/file/tuduw.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/38013415331.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/bf7294804cf2d9389ea5746a06f8026f/vokajasoper.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=beyonce+oh+boy+you+like+what+you+seePDF 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_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 10812 bytes
SHA-256: 8ed537ab02d00195b4cd5dce4cece5604f56d271bea879d844059d6610fbc89d
font_01_sfnt_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 19204 bytes
SHA-256: d5b1840c3ada1ce3dafc8d6d0e5c8bd86b01630289c9be4059485de1e39600a5

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