Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c96a7b42ba1e37…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 17:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b45eecf6303b276fc10e67438fa56833 SHA-1: c947a1a412186d4f34a9225a76ab1360b06c5b6a SHA-256: 33c96a7b42ba1e375486e3e39612ab032b596764950c2702c83085f41014658f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://laborke.ru/uplcv?utm_term=pdf+%D8%A7%D9%84%D9%85%D8%B5%D8%AD%D9%81+%D8%A7%D9%84%D8%B4%D8%B1%D9%8A%D9%81 PDF link annotation
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9b41c200---fevadugefamowovawuxokij.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b733ff36---79349018195.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/bm7ev7bnmdudnckpems7317dbo/pozadexovuvula.pdfIn PDF document text
    • https://andhimazhai.com/images/files/vewexo.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/lojenutusuvoluwuzufalef.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cfcd59765---kukutopenunorid.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd1f36ba65---rosotuvuvu.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/2825236325.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607274198897e---vukiduzomiwojoxalewetidud.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/tebikigozimidabew.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/91914293813.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/joronilip.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/xojesunetuwemokujo.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/12820254430.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/59240033625.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/chr2a41ja9artepkd8iu5f19e9/jozudunoposurot.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a063c6614930d219bc1ae5be36117816/gozetidiwi.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/601632674.pdfIn PDF document text
    • http://dakotaterritorydevelopment.com/ckfinder/userfiles/files/somegidiweruwetovuxebiw.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f820f108a583c60bc0d7d46348dacdb1/65287767313.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d0004ad6e17bf47a338b5894d50e9a99/77716033585.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bd5ab4f3f---fuxekomaworudabezabiviv.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607586f003e07---posunalosisonagefedeboluk.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/094636cce742d88391847763a886ab8f/83601077657.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/fijiralojalija.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/38444903040.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfa222391c---39828481821.pdfIn PDF document text
    • http://mid-europe-ex.com/31991399410.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
stream_003_off0000de06.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE06 22340 bytes
SHA-256: 41e1961fe36116688709997d67ac103aa8637871c16b37757f1f64cc7f3de435
font_00_sfnt_off0000c1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CE 17956 bytes
SHA-256: 81a58c3f1c2e2e2d2f72648bbf05116b1784dd3d4399574b311c36d514a6317b
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 18608 bytes
SHA-256: e02d4d2be1da4b7764bf3ecbd279d66e6bcec05e533adb2b5b820db4cd7498f3
font_03_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 9324 bytes
SHA-256: 49f93db56aae11a48979752334f7f549d9145816f03ced3f94c9a9d53ae88999

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