Malicious PDF — malware analysis report

Static analysis result for SHA-256 7873b3924bd03ca6…

MALICIOUS

PDF

89.9 KB Created: 2021-06-11 07:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7c50b1f70887fe14e713f119b3557f90 SHA-1: 937ec615f273782ba52f9dac2a92bafafe5f39ae SHA-256: 7873b3924bd03ca60fae6953f300c4c97dfcb23240edc95e09f5d92ab4b74653
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users to phishing pages or download further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues beyond metadata.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=inshot+video+editor+without+watermark PDF link annotation
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e6952001---zawuduwabudasizopu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d635cd2eb4---56851672217.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105250833348881.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/308965182530cc9581ebae3249a81773/25208159625.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083521995214---xomufowoke.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/72aaa3f7bd837e57fb545598ab5f4483/40190058638.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/96995495508.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/wuparamuzobizuza.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609374254de89---begifolosiwakoxese.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/o5a1isfscbf7fh7j0jg7md9pdv/56743620675.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/burulutapawuxobolugegi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1d3036cb---25430559773.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/88040760421.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/xelosazenovevepubad.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd4ce7e60---bomiwewolatoduzigo.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/dugutuga.pdfIn PDF document text
    • http://renovator.cz/files/file/menagiropirakigaw.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ae74b4cac76fe0267ba2accb1103c71c/79665866972.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/jafadasaziveg.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6b82c95f7---vineloxuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 5068 bytes
SHA-256: b762e680240ff8b2993aae4ff2d5636332d35ec11049095aa1ebbf16081028d6
font_01_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 2044 bytes
SHA-256: f61e30c19d312c9f157651fba7f5824753e20a5bd6fa184456dad9ff4a74819c
font_02_sfnt_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 10748 bytes
SHA-256: c7ef160a0bc116fd8eb5a923f91dea17d8406f42cb3d12a708c9d8d4a9426e98
font_03_sfnt_off000135dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DD 16296 bytes
SHA-256: 8209c5fc27800dad91b79bdc1d2542939faa66d1b2f519a8f9f1b913071849a2
font_04_sfnt_off00014b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B58 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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