Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e0d607eab20ea9…

MALICIOUS

PDF

75.7 KB Created: 2021-07-16 12:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 299a0ec5ed41d323edf945174eb0958e SHA-1: 7a71dba3a5e5b2b348185659a97d0ee46a531a7e SHA-256: a6e0d607eab20ea937b6e7752690ac29c430f473272d21f882dfc94dec8af6f5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The primary goal appears to be to lure users into downloading further malicious content from these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://gyobel.itpublic/file/bameka.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ee2f3a45ad7aa8ee93469d7b39ffafdf/wabaguxojasozexelepiwu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1c42d6d2f---fibebifimebugitifasezixo.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7fd542985---ratapizuseni.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/loferorexux.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e383f1f1e5---19085941193.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/sumifuwebipadapumodudesed.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/81732086799.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/28446214507.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/25759925358.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/67463738564.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b60c3ea2---25404762639.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/46802536140.pdfIn PDF document text
    • http://veivel.com/userfiles/file/nizusilabupib.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/xakorifoxi.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/18856209644.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/masejudowedofo.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/62499042825.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d250e99d36---gutazudizifepa.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/58156503511.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/92452514396.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/telatiwibuvut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+you+convert+an+excel+document+to+pdfPDF 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_off0000c3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 16896 bytes
SHA-256: 88d038de3910e3277da416ba1ce1cd9a554e99ecf9450a45be5e64608d5ba4d9
font_02_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 10980 bytes
SHA-256: 0fc84bfd0cadac095e4b57f964858e222cd8afa98d720a5e050ca80292a9d5eb

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