Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6069a760c7c0896…

MALICIOUS

PDF

95.7 KB Created: 2021-07-24 19:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c98e85263d196029d5ff0827ab78f1f2 SHA-1: c589dc37ecc34b2817956ff30b43aa3e1a347ffe SHA-256: b6069a760c7c08968e6985de2ea699467c51d63a54b35fb524af58f6138521f5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gongotour.com/FileData/ckfinder/files/20210609_EA1BDA976F310BC5.pdf In PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/99669141523.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/aee6211f192bbcc51fb291ccf3e39dc0/85782336426.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6db542cc2ba5fc3802644d7f1924a12c/mewaw.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/mevobipopu.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/46733889653.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097aec9f050f---354144177.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/438f9e4a58717e3b1376aa9917d0dc96/55480714574.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d04803b88---6672724549.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/df6b14ec8aac5184cb73c8f8717e2e33/67972145115.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/b13em9202h1979pmueg273qfv3/fotuze.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/21f43f481bcc8d055ef1dd7fc6e796d2/vezurupomogakezi.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210721040437_h3jwnc.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/62227731395.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/mixuzitu.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/92936618042.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b79f87e73662364a0e04b51647366f53/4236303085.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c1c330cb---48173947808.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/xeruvixatogadola.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/73919357320.pdfIn PDF document text
    • https://highrise.pl/file/lerijikifupifatuzenu.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/xeretimekikidal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ejercicios+de+aritm%C3%A9tica+resueltos+para+secundariaPDF 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_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 18668 bytes
SHA-256: af1e35a7381fb29a06d68c5cfd4781280ff55f659455c7068941f3fc1885a91f
font_01_sfnt_off00013c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15472 11040 bytes
SHA-256: 24111f18c95f662b72faa23ad0639019b23e1f4d88179a8770f3fbc69b7b0753

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