Malicious PDF — malware analysis report

Static analysis result for SHA-256 0123aa1b537d8bf3…

MALICIOUS

PDF

93.3 KB Created: 2021-08-09 13:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b66da856bfffc34fed93510a6df712f5 SHA-1: e4a9c0231ee6419abbb3654ea3661c999a0c1eb6 SHA-256: 0123aa1b537d8bf3e4cd2d2a507c387852f9cc9fd0bf2fcd0a5e7f492a66b738
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=pelicula+completa+en+espa%C3%B1ol+de+annabelle+3', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://queure.ru/uplcv?utm_term=pelicula+completa+en+espa%C3%B1ol+de+annabelle+3 PDF link annotation
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/tq3ek2v8qnkj4er4j0gsa280k3/1482216669.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/90350784485.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/xewisimuvarigulej.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2154d0ba---supolejowaxirixe.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/wikedabiferoxeramizebixa.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/09ebba24b55553d66ebca952b2224c23/20010283613.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/fotivo.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59e984b1c---bijenomukiwo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a3bb48523c9e6fe9e9e9cee4fe5f6f49/mevejuxafiluv.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff9658a44f---dofaribetogibete.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160926e92ea4dd---79144860285.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d2424f09387ef8b0365e8d547c04a77d/91168816449.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/ginilafa.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/69796400538.pdfIn PDF document text
    • https://kueapem.com/contents//files/bufad.pdfIn PDF document text
    • https://alutat.com/data/file/fumetezugo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n2okv3v5lgeen3r748vcdtlim0/90062720064.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/12480555871.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a8feaa9ee7781dd721185cd3b303db9/73004250137.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/xetorabozuzun.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ae9f54276---89355429222.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/xapikufazi.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/rerelizeramopufiwidotimo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/knqs9hck3df7cbf7ui3a8ls7d5/gamutebajepatizugeni.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/98086899319.pdfIn PDF document text
    • http://regmac.net/userfiles/files/47620657435.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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00011a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 18864 bytes
SHA-256: 6fb2ee54ef068a4c178f5ad75f685879ba46eaa9616404458b18376a5ea3f46d
font_03_sfnt_off00014af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF5 11192 bytes
SHA-256: 1b1428eb3248e8733acfc0f4a107ea7101af50a1e091ce2288b2328c8f10cbcd