Malicious PDF — malware analysis report

Static analysis result for SHA-256 be19bc749b0ce85d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 11:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da5ce97383b3555c4326281981de7144 SHA-1: 717db6731c33d900948e0481d0e972509d6b69c2 SHA-256: be19bc749b0ce85dfc3d98a08a5df8d70632af5542909a3d20134c6b622cd82c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. These URLs likely serve as a link farm to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=text+me+pro+apk PDF link annotation
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/15722224574.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613744b8ab714---fiwexopidev.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/33421543999.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fad7f6eb43---1875215191.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_7C41D26B0646E181.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0507080268d4a93a9e2e74c76f7417dc/26220113684.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/nipamif.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/41fmrtnqrq9d3773bggl70c63s/95063895190.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2790eb3cbbaf9f9af97076e61d8424e1/42938931463.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/11417398212.pdfIn PDF document text
    • http://chemicalengineers.ie/images/vufodojurebadofol.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/39143841591.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/zaguxe.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613300f890cb2---92408498310.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210902135010.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/93e40b7e849be80f343455b3f582978e/78769120172.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613e60faed62d.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/11941051219.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dec446819---92032605841.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/wasibower.pdfIn PDF document text
    • https://shinaltd.ru/images/file/remewa.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613402ab4b5d8---17567514968.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vvdq0h6ulcjqsifv0f8nj54n4f/jisixagibarokagosoted.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/tobebaneb.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_off0000b4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CE 10160 bytes
SHA-256: 2f29e8ad0fea2ef22fd3b5397898f0938cb55592b56ce4337ede09cba204e919
font_01_sfnt_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 15888 bytes
SHA-256: 70650cddafeab3340d99717983e608c9cf45fda665a5d57e289cad8467936017
font_02_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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