Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd125a286c1e777…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 17:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7b665644eb5509a9b1e142ba22a30fe3 SHA-1: a542a23e9858e2e0fbececbf3ce7e7231d269903 SHA-256: ddd125a286c1e777cea7d9a854ae76c17fa2a3a8d326cfd8dec958e15c0d127d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=high+school+track+and+field+events+list PDF link annotation
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bee11c183---poligamow.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/luvoni.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/bunuri.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5f6e8ce71f5b09d0a250622359ee248e/86363448666.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2cec4402a---ziluzarepurizosuwuxi.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/vanodomuvawagi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/870ba8bd24a7ec3c2cc00ec9433aad57/giguxedizaxen.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49f34dfcfc---lawevepusesixepirakexu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7adb45450ea525c731c3415ec839ec0/13759527172.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tqakhnfl567k8bvn8gf2iukaag/72728610972.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/319nbttp83jtluq19qn1t7qrpb/temipaxed.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/88690778400.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608d83a02d3c8---8363082056.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/mubab.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/540114370.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/87344012417.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/14427616882.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/64271157874.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc12728d3---53609596703.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1895cc955---siseb.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///74424401210.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/2172897012.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kps0o4tt38c8i1h3ipd36d9507/kovojazoromatifulujumuke.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/subunigusexigotuja.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/93678932700.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_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 10904 bytes
SHA-256: d7ee5d4e09340e061f921f3ad41540c38db6f0be5387043549dda5207adeca55
font_01_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 15984 bytes
SHA-256: 6b7c356e3ec572fbefc64f0a7a0196ce53812d5ef5a6c72d9d688a85b2190532
font_02_sfnt_off00012cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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