Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce97b5ec8234150c…

MALICIOUS

PDF

88.9 KB Created: 2021-08-03 03:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a429b9ce9e77a1cec31452c083e56fca SHA-1: 40cb8accbfc2091b1094d0a954806ae050d48d36 SHA-256: ce97b5ec8234150c3fbfd3141c18959977f1c0bf94b2ff6c8af12bf1fdaa156d
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 a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded URLs indicate it is likely used as a lure to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/uplcv?utm_term=wordly+wise+book+8+lesson+7+part+e+answers PDF link annotation
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b41f941da7---23006990167.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecce12c90f4---97019539254.pdfIn PDF document text
    • http://orem.mn/uploads/files/magemijuwibososafafiju.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/68124096065.pdfIn PDF document text
    • http://soupworld.de/upload/file/7853988611.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/jiwafozasipowu.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/19965782588.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/440bf6480036eedc0bf7547fe4f3c9d1/dabatitusoxepoxinexu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/128cb51b3c63c88d410fe56f8e010d15/13436062730.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/5501241881.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/tazenujuroriduluminefati.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3929a3c3b---35268786386.pdfIn PDF document text
    • http://mp-journal.com/media/file/47104818612.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/219f6939c8ffdd23e86c501732e657c4/zipexujapexu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/61cf247ad87e294a0342e2cfa8e11394/bekosa.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/60eb2aa3695ab45a0d1edcb73651a528/20213136819.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e682472620---zogumuwez.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/39842113033.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/suluvoxarawaxobubi.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/jerifesalevu.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/41650191804.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/zipixomubodituzemalikizus.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_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 11068 bytes
SHA-256: c14f544fb0bbfe8116526335e3dce896ff0bf39e22cfed91a445c1d3f02e0af0
font_01_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 17492 bytes
SHA-256: cc4e85746ca9973da985136fb036d24699e67b4f25d163e2d0975e98ed6e50f3

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