Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ead2b9e2f047541…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 19:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c23c23213df2eb31c014b9d4e19560cb SHA-1: de54d15c42e43a862f761e58ab34e290e9c7b6ea SHA-256: 5ead2b9e2f04754187b102c6838281964f885d8f6482af00fa0ec68edbd11c56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads, a common tactic for hosting malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lure users to malicious sites, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=pesticides+chemistry+pdf PDF link annotation
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a70e3159a72---nibobuvukajip.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/bopuwasetisoraw.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/kus5a4u57trv0o3ihoka41sdaf/29229748132.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c90102a4e19---29778573691.pdfIn PDF document text
    • http://xtra360.net/campannas/file/pajujemokubi.pdfIn PDF document text
    • https://subarini.ro/mm/file/rozitekemuzoki.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/sozaze.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e67a00088---68416790587.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/549de60238393ff5dbbd0404d95c89a2/31682446705.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/93911966787.pdfIn PDF document text
    • https://clubon.top/uploads/files/mopamezotopufavozegejemul.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3361dcc98---41897229051.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/tadujavov.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/zumavof.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/zawoduralejijisovununaw.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072133e2335b---88546363710.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/40333187288.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/mitububuzebufibawuketa.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107182324397307.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/susofin.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9ba68b6a82dd3950db0ef49f47598441/65427284854.pdfIn PDF document text
    • http://riversedgefm.com/files/file/zabetenaxudifu.pdfIn PDF document text
    • http://darstin.com/userfiles/files/xolekonujubigoforelaxe.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b88b1047c8c---28292731878.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/31558592364.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_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 16424 bytes
SHA-256: b7c3b9d7899a08dfacd8b61bc3d9b44fe2aecdc122381985c3bd80c55e0c15da
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 10568 bytes
SHA-256: 37e8921ce67370320324616b2ebf99dfad9f8484797bf190356ea5cdd3700eb0

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