Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d92b24a8ce873d…

MALICIOUS

PDF

75.2 KB Created: 2021-06-27 20:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a12cf6a725ea5a7b1c43993df3358eaa SHA-1: 18ecf5f31eba85beee5557b4ed922f4c1aa9ee04 SHA-256: 81d92b24a8ce873db99fa99d7c6d734aea731a9afc0a361be5b2e1adc153a1f8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of malformed exploit streams and a link farm pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to download further payloads or collect credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f21d17695---65918096541.pdf In PDF document text
    • http://musicpark-live.de/userfiles/file/32605386694.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fabff0dede---91698711930.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/zejotufevipegodepakanupiv.pdfIn PDF document text
    • http://allasclub.com/campannas/file/84500194066.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a0e43e50d---35990502844.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/77983298092.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/iev63j099fv9uhhui8mdpj3ve3/mivurudoxezusa.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///18862937794.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7267a6257f---69661831820.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a3da90929e8fe1dab8b6c052c057a48e/43518961422.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/92312829370.pdfIn PDF document text
    • https://domilot.com/uploader/files/45064087917.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b70e62035b4887af4c31b7069de94f8a/53468332706.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/mixedebusitibarotipej.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/2367099423.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/pojixosexilitedado.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/jv9l1mff4pn9rhk4aqs8unme67/97494820740.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1624004005.pdfIn PDF document text
    • https://soechi.net/userfiles/file/juwinovetexarelabu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/10c698d30386653cf4fef5c3261c09e2/53467479749.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/jomosaba.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/29689445521.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095de6412569---rumale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=parzival+and+art3misPDF 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_off0000c133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC133 10456 bytes
SHA-256: b777d5333bec9a14e86b86e69d8f2cd6bf992d60aba0d5b7d8673e11a11eae4f
font_01_sfnt_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 17840 bytes
SHA-256: e404b143635f36ffc85fa46c4dd3be536c2f83cff3f776d2b5b30db11ae8a31f
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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