Malicious PDF — malware analysis report

Static analysis result for SHA-256 33eda4af22918aaf…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 22:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d812dcec4f00e821d3e1ddba8fa6ca36 SHA-1: 97bec30fdeeee702c39a211f7aac587791b06e6e SHA-256: 33eda4af22918aaf20cbc129f191cd04bb66f190c17cbe9cb754cc532d10ce05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicative of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://haithuanphat.com/uploads/files/nipojekubelofarokujob.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613471b2584b8---59298782808.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/rovavokutisajinamazu.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/jadawofepulufuzobuw.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/49313895996.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/8734749871.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/watugilisusu.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/42621066341.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/88427567569.pdfIn PDF document text
    • https://carlojans.com/cms/file/wuzesamodevoje.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1a73b2bd3158cbca1dfaddc95878ba08/83892068972.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/11761195537.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/lifotataziwapusupojorovix.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/10439774773.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/35383891760.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/4277741288.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161333b4913eac---96141330588.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161374e84c1a8b---72221893524.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/90506847758.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/6943950570.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ctgpcqao6pqrk2nd3g3hjoi4d4/jevikozadumilenitidu.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/13105432296.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/dadowakavunapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=demon+slayer+infinity+train+watchPDF 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_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 19132 bytes
SHA-256: a5448c22d7e604b2f1594a1bc4df779763b88bb7335cb294bd0c2c545cf62e9b
font_01_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 10804 bytes
SHA-256: f961cc75803bc0b8a8dbcb918eea402677518f68e7847ae90f7fdff3b2d98841