Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f24885d4341a81…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 01:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ab895b052e1808c24c521272b3ad7e19 SHA-1: 4b2dc47548d4fa14b69db1541ac0b9589ce77206 SHA-256: 54f24885d4341a81b01a413a9cb1deb10faf204e9e8783427ad819a59c7e217e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware download pages. No scripts were extracted, but the structure and URL targets are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://alliusie.com/userfiles/file/56839927750.pdf In PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a94f3cb8dd8dd873f54b573eab093bb6/28762511120.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/c60uoo2t2rp3ilq1vbfkvk6b5m/77088781867.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608943075902b---92870587398.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfee9d64be---gesifemose.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72fb83b7e57dea9f0ffd4001e936121e/24091862758.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7389ad098f4511aeabd86fe9767a8211/dewisul.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae97d59de---molurifozuvi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac247aba8a4---matafatemulu.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/47205960887.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/3fe40b719c61e991d42a8005a99494b1/60158211334.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/lefowirujutivazufugod.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/muxikadipuro.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/85922691286.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tajofuri.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/radajilalebupibufa.pdfIn PDF document text
    • https://avenue102.com/uploads/file/72744193247.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ffb78328f---32765461184.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/buxerujisuragog.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50b734c87---niwurituzoso.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/nutoxivawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tamil+monthly+calendar+2021PDF 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_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 10836 bytes
SHA-256: 80a9dde4da9d28b726ebbe583955f77614d6383058734f91beded069d37bf997
font_01_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 17104 bytes
SHA-256: 77390d555ba4c8ce4eab2c36a2a905639ca304bd8afaadd36d469ec7abaffadf
font_02_sfnt_off00013b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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