Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37ef6b7919130d9…

MALICIOUS

PDF

78.3 KB Created: 2021-08-08 14:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97aa4c95f0f85776f46a2794e808d2c6 SHA-1: ed19cbe9f10b95f5c52c2035a97a64f125b9a0bc SHA-256: c37ef6b7919130d9ba1216eba7cda4f5d7fd4c8b48c28af511db6ec03a815acd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aiming to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=experimento+la+pimienta+que+huye+explicacion PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8ai8r4dje4kaa6e4a92ikf8ipm/94364789332.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/28189916401.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/tisomude.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/xegivorofinebifif.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/91981109720.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2039d223---xugizunifadeg.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/33494944838.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89c36e5f3---21656708184.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/85988536084.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/gilanezixexixa.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/gipoxexusezedomuzidineko.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/kojupunesegiwuvi.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/sawefaduropudepap.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf1b24b60e---fapuvefenazodogav.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a5d99601a---gofuvujoboxoperugasara.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/vuwetilalazewa.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/40388188095.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/32679166065.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c43abf894---wuwum.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/eed8251015a1f0e073737af2c6863c8f/lagutuzomubokakolezi.pdfIn PDF document text
    • https://landbar.com/upload/files/julamazuduxadofutogud.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b7d32859a029c62b76d16ab2f877b246/fuvaririjudosumaxaxeb.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b42523c302c---ripisadog.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/62357750632.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_off0000cb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4E 10916 bytes
SHA-256: 8ccd4b7ec62826851549f466570c59089bc3872561b27423eb9ffb0f37f4c018
font_01_sfnt_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 17632 bytes
SHA-256: aa9b7771bfaa25c46d68002a146865e09cdd0ce6927bc6df4cc564af65fcec63
font_02_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1