Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e822358398883b0…

MALICIOUS

PDF

74.3 KB Created: 2021-05-15 03:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 48c7f5d396fe56e6a24b8b5838445b5e SHA-1: 778d290976f0193f8f9e3925601edc1fcec79cef SHA-256: 7e822358398883b07845fc91617b939c2d4d6fb864322037779e8326cc7b47a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document's primary purpose is to redirect users through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yssnewlessons.org/UserFilesTwo/file/nuropadas.pdf In PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gujig.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/33a4c2680784d38e6a4f7cd4f6c0eda5/rawixenujepawewexa.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dc54c07c9b3c22780704711c4b33808/rotizabi.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202143073708969.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/13142342897.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/gitabedigapebewutez.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/e4928e12f2eb55f03c88008850a3566a/28972340205.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/03a0a360b9443dde1a4583df5938d906/9257992465.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b9b8c75475b7f04b54feb112f388e719/duwomul.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/358908120fb947a7e6afd68f9ae4cf65/31802817087.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/12579694394.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/70196337779.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/41d8679fb5a5dfaee4cf258588659cfb/sekedawururopapodavoloj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=akhiyon+se+goli+maare+song++tinyjukePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 5332 bytes
SHA-256: bf575a2e255aae85e4e870e827dc44d4c454fb6c0b0fb711dc69375fdfc8392c
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10928 bytes
SHA-256: e27eb8d574d60f36d6948abb155329ee3fe24336b335af3b71fa0966bf1da1a3
font_02_sfnt_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 2628 bytes
SHA-256: 51d3f8e2413fb567eb320bea2ad89c8159e7de342b227de6b46c01a5dcdf58da