Malicious PDF — malware analysis report

Static analysis result for SHA-256 427b83af6db50bba…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 01:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 99fffa3bcd5f99b78d861f529c8ef635 SHA-1: c7bf307b1af5722ba70e5f80b8c7f730c8c7d1ba SHA-256: 427b83af6db50bba3af9035973e725104986072373f71d68f002895524ee013c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to exploit users who click them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/901066610f8ce5d8f4ccd3fb61fa897a/mavujipapugenusotanina.pdf In PDF document text
    • http://indago-rovigo.it/userfiles/files/fazefametopasevelej.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/nubejugexis.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9f5abfe6---sakorefuparus.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/14764713052.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/538a68d90a0025c4fe5cc51cc0cab222/81964673625.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/pujevogigexesuwokipekeg.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/sojarutunusatoge.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/fokerimifejewatanilejuf.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/21f3e5ab88d9aac823e2cf5aa62b8860/90451134185.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/0eb8259ce2ed65a9cc0059d97f7125a2/33442308683.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944e7ed05c5---mofojowojisuraziwufapejux.pdfIn PDF document text
    • http://info56.ru/userfiles/file/66111537551.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160702490b7d41---faxegixaxum.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8f7e9012c5b80c779849bf78a816c595/76358277583.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9865fe17243649040e8c1a251049dc14/wuvexe.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/kuwixafazagevixofotab.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-13/20210613111740849175.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/mopafilironaxilaredulemo.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/72419005424.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ddd365fe027648535b325897af29af2f/73997731896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=typing+speed+test+the+quick+brown+foxPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 11432 bytes
SHA-256: 0b86a1da6fe1f2963ea5ded0371b3ce356b00f9cdc0beebf7a0d89878f47de05
font_01_sfnt_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 17120 bytes
SHA-256: 59c45c70582383d65a5f4bf0f427b0460cfa3e697c48ba68b2db51236cf4fc7d
font_02_sfnt_off00012dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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