Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cb22d970a12d90…

MALICIOUS

PDF

72.4 KB Created: 2021-09-21 15:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1bf2c3629a3b1908ab81a495598ba23 SHA-1: 33d0e27709a387f4b9268a210cdef73d23080bfa SHA-256: 73cb22d970a12d902411f9b64cd36f3aa1b7470e0e5c8a0816e6ad3605306d10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards a link farm designed to redirect users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://inwebjor.ru/uplcv?utm_term=movie+box+pro+vip+android PDF link annotation
    • https://kawanmto.com/contents/files/xuwomu.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/37982015247.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/vipatutajuretazala.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/93101441855.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631067303_4d977d22db.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161322fe5ee1db---98408532423.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/32378441612.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/41202072515.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/44815518087.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/zuginugo.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/kutegafabuv.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dedizefepojuvusidavobi.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/salefoluvesisexodumuzixan.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/88001024259.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/daferufelasi.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/84138816215.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149b55bbd7b5---45204310187.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee8a9a324d---35963331443.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/39053539199.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/42622584766.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16149138746f62---49739701025.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/66280129515.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/oa3l0ih5oq42i5bc3shm423efi/93981459734.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613495308e18d---77436466514.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_off0000b7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DF 10376 bytes
SHA-256: b0dad26c5a5f90c5c68a28a46559011b54ed7fdd8e9a2d99274a34a53a8b8a67
font_01_sfnt_off0000cf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 17240 bytes
SHA-256: 9f69d65238df5c706522ccaa03261a0650b56fbc34e4e6dfd40e2e6a35e37892