Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca9a71b24cbc1cb…

MALICIOUS

PDF

69.0 KB Created: 2021-09-05 04:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 536381789de4046f8078233763ff0987 SHA-1: 0cb483cc60f15d3df6610eb7b55907958c75e686 SHA-256: aca9a71b24cbc1cbb96e2fa286fcb0fe07fad533a318ab7e5c110884e9f188d9
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, utilizing an image-based design with clickable action triggers. It contains numerous embedded URLs pointing to compromised WordPress sites and potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=metal+gear+solid+2+theme+pdf PDF link annotation
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7d121f2ab53cb530c5f8ab5865b3c77b/lewireku.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jjig36uoogqvk7buc0fa1jlvg6/sadutupasedekeviduwu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/1fa27fd646b701500a41b53e5e766e19/5654830165.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/bolavuf.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/4321489418.pdfIn PDF document text
    • http://jkohut.pl/file/mesero.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/63316798621.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160848f34262d4---gepitijowowapuji.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/39745792113.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/07a4a5be7cb94c693da13f51fb30c22c/novijozilasupudefusife.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/duxemexuxovanijariw.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/81964073831.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bc104230e83---bifuxa.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/rujitolenijawaj.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d29bb313d71---sigisezepoba.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5d9c5ea4---40573195028.pdfPDF link annotation
    • http://446888.top/userfiles/file/rukidapotukuloposomoxumib.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f4e27224---11597194337.pdfIn PDF document text
    • http://becucci.it/userfiles/files/kidukevezaloropewoge.pdfIn PDF document text
    • http://stasta.com/userfiles/file/3985364692.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6bcf3a0f61686d64529c9be92a34bbbf/40681844245.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84d9b443d---zugizujokipegux.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/35011408346.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_off0000b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 10956 bytes
SHA-256: 248008de6ccb2bcb953517258a36c62f53d97092193f2e0cd2d9c99d07d03635
font_01_sfnt_off0000caf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 14348 bytes
SHA-256: 8265ba9eca4461adafbf6eb29257632776f39d7cc6506d97dc34831be8394dcb