Malicious PDF — malware analysis report

Static analysis result for SHA-256 73baad6e337fca55…

MALICIOUS

PDF

81.0 KB Created: 2021-07-05 21:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6aa0d197826a75ca8517004a5af34a1a SHA-1: 7a6f2d34df551a459a15b25d4a38a068d2961495 SHA-256: 73baad6e337fca551830520afc64b54c122d72ec799ea09904b1b2f946cbee49
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://noriupapildu.lt/ckfinder/userfiles/files/jatuzebivubusarago.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/61705685149.pdf
    • http://atenngo.com/admin/sites/site/documents/salavolofusivole.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/vp7fdt9rpda5rif1ia96b0kf49/57008946159.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/bbe335f231f1d173874b01597bddc250/98563474644.pdf
    • http://dui-antidote.net/images/userfiles/file/xupasekarojefubufufonesut.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/cb2aecb1701cfe35c43e587f7a2f2f6d/risoxexirazuwije.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89b8bd73b---41341595932.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e37984da5918593aa0f2032b59aa6f34/tikowo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2eecce3e9---pewexatawudasuxipo.pdf
    • http://chiari-web.com/ckfinder/optimist/files/gixedikejanevi.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/87f1e8c623c660b331536ea7868b7863/baxojupefizonorajax.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a4eda25364034affd5ad0cdfa083c825/nanolaludi.pdf
    • http://etasystem.net/userfiles/files/65047480880.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c5fd3b9a7---3431072379.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/q17mo9uqdsr8mf4pqlgfsrv4rr/pabowukavejemovojusijoto.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b93989d6e3bf7dc3d43bb24231a3dd2/13713637162.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a53efd1abff01da4d89b8fa3bdd43db8/84399235915.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77dfe78f5---rupuzaxosajuboj.pdf
    • http://meble-tk.pl/userfiles/file/15171698263.pdf
    • http://beiwendq.com//data/attachment/file/50640928487.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd311f9cf---30173777661.pdf
    • http://alfavs.eu/userfiles/file/wipafe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=clipart+images+of+boy+and+girl
    • 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_off0000d798.bin
6799d6f4d7f8e1944fa783e87a0146df02d425fb06709ac20129bd96483a801d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 11124 bytes
font_01_sfnt_off0000f12b.bin
66862e14c328fe74c183be9edd723bf306847c3f37806c4587760832d99ee107
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 16728 bytes
font_02_sfnt_off00011cd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 16792 bytes