Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67a19d5e7050683…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 22:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a4dc16f75f04e839348420ec89866c8 SHA-1: 911f1d2f85058d609831d2d7007c950756ddcf33 SHA-256: c67a19d5e70506834f5e68aa985c22c42ee3bf59799358344fd1d520a3efd992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple external domains, many of which are hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gyarmatilovastorna.hu/userfiles/file/54202073730.pdf In PDF document text
    • http://lnv-cnc.gr/userfiles/file/nebibopezexojopitasopator.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109170135484341.pdfIn PDF document text
    • https://sanagustin.cl/files/17992048331.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613beefeb332d---vuduvi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161415ac170a8e---64734245591.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/petogufipudiw.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109081301399210.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/zapejigejagozogapegokeb.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/85700020752.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/panepebulowu.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/18508383058.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/wokukeromagupamepoli.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/55942033176.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/44102133545.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/37889264763.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/pepiba.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6cf04754397e1325d4da2ec6bf8b1978/2467054041.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/40769123289.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/33932262447.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/dajititiwuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+reset+iphone+without+power+buttonPDF 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_off0000cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB6 17196 bytes
SHA-256: 650733bc3e96fc98a4928bd388c4a717354410f47ede8c95827b593e90526317
font_01_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 10456 bytes
SHA-256: fabcf85a3ced5b000bb038ac23e41784f22a0fbbf4116b930027bb47ff5f9ebd
font_02_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1