Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c692bbbfa242a11…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 02:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10957d08ea8ed72abe227eb21055b352 SHA-1: 5c1fc061b61669824df8503116567be991c803d8 SHA-256: 3c692bbbfa242a11e09ac45808321fbafa7efcd23f2184aeb0ba2a516523be29
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the 'super-forms' plugin. These URLs are structured as a link farm, suggesting the document's primary purpose is to redirect users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=compound+adjectives+worksheets+with+answers+pdf PDF link annotation
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ae8652e6cb71676c1ef54377a2cea8ca/jeranezewum.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/jokot.pdfIn PDF document text
    • http://armanetti.com/images/24305991770.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/85635668293.pdfIn PDF document text
    • http://trivio.it/userfiles/files/10039102542.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/98494074795.pdfIn PDF document text
    • http://asfalon.com/__files/file/mugegalokadomokuwun.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/7fc0939a597872b9d439449f5c77d43d/99876628849.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0a51968e8---26075897359.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/74174424680.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/8935830104.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/wisirajinosirane.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/1525221f03e8c734e020cc9012a29eb0/jexipumufineko.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/jovirivonajamo.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/22909971666.pdfIn PDF document text
    • http://nova-auto.com/upload/gudemibovamewirijex.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/7bc1688e6830a0d0426fdbaa57b1841d/raledoxosogawemufere.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2f149c3f---45061075562.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///16086189933.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/10326766236.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/pijomolupatolavema.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021063009170773499.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/gizigewur.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_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 11344 bytes
SHA-256: 6f9cab26acd71599217d1e564570c591d22af069a425b304eaefe4a0c2a1cf14
font_01_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 20388 bytes
SHA-256: 19ce0606a9baae6852d675c07762e3393580f3723eaaa168fa17b733a60a836e

Open this report in the interactive analyzer, or submit your own file for analysis.