Malicious PDF — malware analysis report

Static analysis result for SHA-256 192b0eb72315ee64…

MALICIOUS

PDF

109.6 KB Created: 2021-07-04 07:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97f0d7fe256a13cf88c133fb646b8bcc SHA-1: e1d2773ee771492cd90449fca1e049dc10498a19 SHA-256: 192b0eb72315ee646f3cd8fb7526f106d3ae310c6a3fa8348644357f5f9a1ded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary evidence comes from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://ketchas.ru/uplcv?utm_term=sarcasm+easy+meaning PDF link annotation
    • https://narimasu-chintai.net/jcfiles/file/60949516813.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/19879664804.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b15fef01d67---sisakuw.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098368559050---74380400709.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/82591493166.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a745bb47df3---57141512074.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f550a6993a7aa4e4c176dbc7438712c1/77141336765.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3cbdbe62---josume.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2945921e8d---xovabema.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/fuxer.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/gomawutepewewedejak.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/opukedjmeojts0m5lgkkulr1af/90385873991.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cccd6d3de7---73803350262.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227988b9c9---latinutetuse.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5c267692b---99595032797.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/xobesapogerojof.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/garoso.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a0f172b2ae99dd1d8229117c5fef2638/23924053625.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/432fc74e3905c792fce1e0ce5e597f6b/wojosewoli.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7e2bbab8d9ffba610c48c04f887da193/nusupenuwubogisexurew.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/kuzoxixuruwo.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cdf6bf3565127d5ef2f3564c05e2a237/56117303346.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607254a82a7dc---71079187072.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6d497b7860b8f24243f1e2da0db537ba/moguvezoxosidozowigagu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 10496 bytes
SHA-256: d119ed18be3b1226a74e7f06c990f634b79e0582c2eb6d2416e07e43cfb0b3b5
font_01_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 25736 bytes
SHA-256: cf91d98761600e71db6b1d158f74f9bfe15ab82bed8bfa267212f4122d80b465
font_02_sfnt_off00015891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15891 23588 bytes
SHA-256: a6b08a719ecf29f2dcbaa7b06e8cb8033304a1ef6c2e6f542ef4658be2853d22
font_03_sfnt_off000183ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183AC 2964 bytes
SHA-256: 47db9bf81a0bee24c8e6bb7cf094ec98c8ab2e6e2d7baa551cf10073d6b0cad8
font_04_sfnt_off00018ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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