Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab55df47ecef969…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 09:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a17ee4c04970392bd464edaf7cf6390 SHA-1: ddd4382162b7184da97cba2e892219d31787d5a1 SHA-256: aab55df47ecef969f69f83a38999086d52eac36f68ef6db892d22ab2aedb85b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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=vocabulary+book+for+ssc+cgl+pdf PDF link annotation
    • http://savemaxint.com/files/file/zuxinojop.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/67324757201.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794a3bb78fb---wamogukerujadipobo.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/9846385503.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6v180vmu6vo0n29j1s6g2tfn2d/30445024089.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6c2fa025dbdacdcf401d8f011b1282c4/99219077779.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1e6b7a529d58f0a133871719c0890472/kewoxeribizujezufukadoto.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/kezifopadosajapakesije.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/56b52ba1dc4abc809816b77868c558ae/davakura.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/31340539805.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb66280685e---xesakevodobig.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/52417231244.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/wavinome.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/waxuripexavobugedosiduba.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/jadapamilokul.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210630_06C47FCAABA29124.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/j61ptsb14t1rqth7s9val2721k/zupexedejiponoxid.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c4298d219---laxokudaxerekinigujiva.pdfIn PDF document text
    • http://bscartridge.com/pic/60682347687.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd61f9808a---kerudelewox.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/38604683677.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/43300605485.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/nakukekapumomasisuvijos.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/xotoxuge.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160722ec763746---jiresutale.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/th025n9ib6bakcf88a8mupsqu7/63126960780.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 10784 bytes
SHA-256: 28b92ec6ac822ff316524f66525b9ed7f5b721d39775cbd52a37a3e8f8ebe446
font_01_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 19304 bytes
SHA-256: c6e3531f4608d733096cc19e6ee906d6dbb7e97b8031772985e0086cba687ef7
font_03_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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