Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d387eec5d80ecb…

MALICIOUS

PDF

78.4 KB Created: 2021-08-10 22:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7e8c1472aeb873cc650e9d4bda79453 SHA-1: 029c6885178f447a40be879cc1ad449489dad9e1 SHA-256: 87d387eec5d80ecb9d2781dfa6dfa65f6f50079e76953f14696391461d6b5681
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, characteristic of a link farm. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be redirecting users through a network of links, potentially for SEO abuse or to serve malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/xexuwubudusoxuvafaz.pdf In PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/josupo.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/natesopifago.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/23456361728.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/17799194877.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160900dc9d4891---wasisebotabagonixivuwe.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/19f3f9c656cfe2defb41bb3587ee045d/39752264090.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/mutizafanazexugowaju.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090255c9750e---1895441676.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/jalivinenuxokezewo.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/61011923330.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/bojitinawizami.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/83210939442.pdfIn PDF document text
    • http://gdgom.com/upload/file/210607204958871442pld34yl2ozje.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/kgro4c7ltme4699sb9rup3t3s3/gogoxerupo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ab54e0bd4ea---topodal.pdfIn PDF document text
    • https://chptravel.ir/data/file/36499412987.pdfIn PDF document text
    • http://hrudolf.com/userfiles/sutokopinipojagitomaximej.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/17038788859.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/72472966572.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mkvj9rno90jgqdmgl96lqqv263/merewime.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/76782226558.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/73374482224.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/40235673527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hungry+shark+evolution+mod+apk+version+7.0+0PDF 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_off0000ce5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5B 16132 bytes
SHA-256: c4315a7d51c71c365906455be386ad697d63854a43da3f92218883f59b99e738
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 11440 bytes
SHA-256: 95583419af8ccf0d3ee3e48690f7837d9cc63c21c9e17dfe25840f7b33af349d
font_02_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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