Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c3dfcddce20a62…

MALICIOUS

PDF

109.9 KB Created: 2021-05-10 07:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aae594d9ae51ab08121381dd22bea713 SHA-1: 25dab10aba7085246bece1c18d1c81244ab514c9 SHA-256: 66c3dfcddce20a624c2d67ae69a728b6edd1e5432361a38161aacf05f4a9dba8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/uplcv?utm_term=amiibo+nfc+android PDF link annotation
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7vqqj97o604mj0mrk5h8p9rv8j/23137858097.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile/%5C/2021050701453796.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c015dac5---bapapezipasuzi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc149800d---29748639871.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6af37735b7860d7e1493fcf6e776c906/28165513725.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0ff5ee1d933b4790d1df35e395e8f2d3/2085338286.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6dojeba2efclajtffq112dr8iq/sozule.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48ebc0c4b---3487957928.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/97boj2ab9hen3jr1bch0784qu8/vodadakulede.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/8633bbb7d880742c73097482f8dc0d4e/57215056196.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/8c51b5c94520f86202ce5c645229ea11/4524785831.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/8j0au0qutkngil4mu62p01f933/10789971527.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/gvl1jadh3hikuq1rvr0825ql32/68731036609.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d5b04d334f9348ca4106c39a3b2cb984/79056945726.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 47624 bytes
SHA-256: d6a83d1b00a17f95703c661b444e13a757749b00e8ced7b9561f2c269a423e1d
font_01_sfnt_off000163aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AA 5084 bytes
SHA-256: c650f82bee5fcbcfcb637bf4ca9ac5574a1e36116823c58a813e3da8b27df466
font_02_sfnt_off000174e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E4 10320 bytes
SHA-256: 5e8cf57f60bb1d55b72942e3f0eedf8db3daac803fe7bf721e3c31c7c68b0e8e
font_03_sfnt_off00019853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19853 6100 bytes
SHA-256: 7e5c9139297f869a010cd78ca7e17de8f7d6fa176029df28326cd3e8f0774f4f

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