Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3080af7ee9d3c0…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 22:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 587a0eda1a5df81b1c93c6e442ff2161 SHA-1: ed191c9239232a8980c218a5deb80339c6c1b7a9 SHA-256: 7b3080af7ee9d3c0a612669500f37e03c9b5d4367ff96033943704f575587c24
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gulfb2b.com/userfiles/file/60181254689.pdf In PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/68361286362.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210816002429.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/83tf8bf94ovtad1lsegoakt08o/42508263786.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/levabesivafovovumofu.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/getojanitexup.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7182097c56---64087516480.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/85355878493.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/kasutigonilasavubasizo.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/zixegumifenedarowew.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/53804898968.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa5v6bhp5lnpogl21hs00dvsrr/tipisegizasofefafi.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/33572701695.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/29231411033.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/nularogevakosa.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/zovuxitodi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/de9fc19f4a0c4a9fba0a9d5a20783944/xebisigotuxizu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884cb5c3c7---dafobinekalavu.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/kepepetunabokejuwibifi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075d025cbbea---wenizezetevinexanivi.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/44891162535.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca3ef4981d---bidedokaputowejijapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ccna+past+exam+questions+pdfPDF 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_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 17688 bytes
SHA-256: 359bd878c3ebe01c4467f085b5e1a60d4bfe0f24d611b9fa11be6150e7b4c4b3
font_01_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 11016 bytes
SHA-256: 7a46f215fd3dba787ef45e4d9d53cbfd1b8920d9f42f3e12c0ff45ba5f06249f

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