Malicious PDF — malware analysis report

Static analysis result for SHA-256 da79bede8ae544c1…

MALICIOUS

PDF

124.8 KB Created: 2021-08-19 16:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88179119cc557eaa2ed288563f301e62 SHA-1: a8c36380f85f9c2a32d96e286057de538078323f SHA-256: da79bede8ae544c1e606d5769ec7bbaa4b7f6fd6472f20983b11b558e8920aff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the nature of the URLs and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=ipp+inventario+de+intereses+y+preferencias+profesionales+pdf PDF link annotation
    • http://ajtoablakcentrum.com/_user/file/76472281746.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15ae12e84---bovepuv.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9e6af82b0848a26ec00ca468e08a4356/tudewovipefoka.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/bokodifuxekuwozirimi.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/tarakapiliw.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210624043436.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a346f1b0c243387eb2658fd10aca979e/13109101507.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qi71coaugqj3imuejoa3sltdhq/vuxikalasedaruxexonisa.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/83454969001.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/pomewaxarol.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608149bde3e15---48515947831.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cac52efb8---zovapimozabivedimopoli.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aae50922eb---43462887881.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210702091356.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/paxelax.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210515024135.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/zusuzijujesax.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/larilopimekef.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/57113447359.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021080202372020.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/579a3c9eb8e99d899e01297d545ae56d/69182975758.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/guxisifozipodabutigaw.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/cb1d1bea639d4716f76e0f32b797e733/73829225865.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/zirosalepowoxal.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16116935b90896---bazatobilaganobumuziv.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/34235113453.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001808e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1808E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000198a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198A5 10744 bytes
SHA-256: 233a08f32393db886d2bc54cd38086ed0b18339b6c92383d5e0ef47f418037b8
font_02_sfnt_off0001b184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B184 19308 bytes
SHA-256: 335381d716fdc9edf8a2100b649ba7e46a74c43adc8cb58598b8e255141512ad

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