Malicious PDF — malware analysis report

Static analysis result for SHA-256 330a2f50316c4b1a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 15:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2fdad04cdf5c28a107dfa3f16cc42f47 SHA-1: b4e29360f61ae32707da66afe7ba4f82bc4cd869 SHA-256: 330a2f50316c4b1a87986f9ab70bb62acab5e69517fdc1bd6a8c89f39bafd6f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://s-privod.ru/userfiles/file/zifevurebemumikufo.pdf In PDF document text
    • https://latework.cz/soubory/8736048441.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2792f7cde3---fijejuti.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161048d0419f67---54738649347.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b3a087bd---80286281430.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b3b3fab2---wewapuvujijotenerixanoras.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612340c62431e---zutitul.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/71946459470.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/pekagenabaxixigafa.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/kelilonudefinalavaz.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/61676791368.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/vapak.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fed1f22c6---kajoxit.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/butegeko.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/e81852ddb1baa50cbd68c07bdb7727e3/nolusaj.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3905e5ff---48137579830.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/56805164552.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/ximixesapatum.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609654d5e54bd---75732980446.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/22176511759.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/31510712631.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9248061539.pdfIn PDF document text
    • https://motiv8workout.com/up/files/dolegikum.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3e81a0787d58cb2b5e3ca0ff4b6fc684/13311288992.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/75b52lt0sqsdhjsc1pa1vi73s2/kadugelidanupudil.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/xidalekes.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12b9520ce---lavibuwasifufetopewagasar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=piperacillin-tazobactam+%28zosyn%29+davis+pdfPDF 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_off0000bde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE1 15796 bytes
SHA-256: d1f42b59bfd179d4360c2d6b5a23e64d3eb964fc26492f240ff9083360d780de
font_01_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 11352 bytes
SHA-256: 3c72d66a9173c118b04ad0bf5f52ffae3085672ef5957fb6008ecca94b2d1917
font_02_sfnt_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1