Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef6d89e51b00f58…

MALICIOUS

PDF

79.7 KB Created: 2021-07-15 10:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 30f19ed97883f47dfec9fda37fdac809 SHA-1: 1a223c2ae3e35903c1c4d2fa9009960571d10a03 SHA-256: 2ef6d89e51b00f586fc784f5478685d71b1d96b86df068ae69b2a26ad60b04bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple heuristics related to compromised CMS upload links and link farms suggests the document is part of a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/3thdekvi7osguvk1skoj0gn5bc/rilisebele.pdf In PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/70929942932.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/batufusisetojajage.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/zukaketixuxakepin.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/zuvifunelagaripamudugomin.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/27522412434.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01cfeea16d---kopejujok.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/aav4s5kbng2gr5q07unr2nmojr/11183583841.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5827fa2c59e2f7ceffa58fda3764b4a1/wumemez.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a15feba8f74---vasixe.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879ccf6add2---luvevaf.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ba7693af39227769addde090a85487d7/kegavelawoledogafojari.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/98278530620.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/20100551983.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/monepapakerifiwawiz.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/tolidaxujano.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882ff248da3---kigawaka.pdfIn PDF document text
    • http://boxethai38.com/upload/file/pozoputasavobotelivenit.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b62555147---zodomaku.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608568f164142---lukimivirulexusepanujive.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c88211c972---xugivoxujanizobulovesokut.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/90058520383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=plumber+pants+game+instructionsPDF 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_off0000d101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 19304 bytes
SHA-256: 24a599f65dd4fb1054f6982fbf7016ad5594a8572c441696675064a056415c37
font_02_sfnt_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 10960 bytes
SHA-256: 44cfc7468e7a2c863aaffec37125a373588f6a76aa947873a31da5e1e76c73b7

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