Malicious PDF — malware analysis report

Static analysis result for SHA-256 4547e47b2ebf09fe…

MALICIOUS

PDF

83.4 KB Created: 2021-08-18 21:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fd5c3975eb45ae1d13ad07ef7dd08a87 SHA-1: 0c2ae7f00ee4181d4c39def7c6312bad503140ca SHA-256: 4547e47b2ebf09fee9529bf6d2dff017465a4b1683dcf25716b8ba4a385ae3c0
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://divinenine.net/userfiles/file/12519351904.pdf In PDF document text
    • http://z500.si/files/70874285963.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0c2d6c01f---27980556155.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/75861204636.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/4s09993ef4oceptqpv5dpaiuvd/dusufitamutepexanokena.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/28217750321.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c2553959---zivunexiganipex.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f8895139720---3254159430.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af1d3ae4b99---loxegazuvemipugaveseveri.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/15715806439.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/dawupi.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/27115601973.pdfIn PDF document text
    • https://inncredel.com/uploads/xuxuporonoxikibukamege.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114845305f7b---sirawoj.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/60217415758.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a715422ed91---fosawove.pdfIn PDF document text
    • http://www.puhito.hu/uploads/zewefowanarojanukokaluduj.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a0a01d3ec---paxuj.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/43026940220.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f3cf59ebf083d1b1135c03537cf1a516/70999861071.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/95772474667.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609189481ed45---38843171030.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/rawuviwowuziwe.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/96817058342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=can%27t+access+night+owl+remotelyPDF 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_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 10940 bytes
SHA-256: 162c43379ef1e18b3da4aa9d1507c6e5a31ba272ccf63b0ef54505ff190efaac
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 16548 bytes
SHA-256: 57b3a048418c5fbba6232e02712de8ce79f7eac5de02da0698076d59d6693676

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