Malicious PDF — malware analysis report

Static analysis result for SHA-256 876c01cf8c09e3bb…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 22:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 749bb014738ba04b4c61d7f471eae39e SHA-1: e27fd919f65f8accf9eba4ae33ef25d3e0fc43a3 SHA-256: 876c01cf8c09e3bbb3fa475d0197b49ca1950adb0982ee6d5fc22c758c405601
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of multiple unknown URLs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1ac0ef08---92835879060.pdf In PDF document text
    • http://noospc.ru/SITE/files/editor/file/negojufawuwij.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ll15kce7keiminoloog9joa91g/5326146720.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ec5b1eeff32fc9e9a5606dd77e8dc827/9823217917.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/41381798246.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/dou45f4smhvi0bvb1rieh2hrf9/laxizefemigulirepu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e87afedc---baxitupux.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/26401153584.pdfIn PDF document text
    • http://didopack.com/files/80494843993.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/k9nj67e6ukqu82t2ln0ssvj54s/rixelorufiwi.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/toxabonekemigagi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/abcc9b015ee0b65f5630dc2df4b8a1cd/tasojenivununezekuno.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/64948400639.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7c77767bc959e2108d66ee42957e3a2d/97109827039.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd2f69a7e---lepugubur.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/188bd6f5ce18f552d92793f8af166a25/gelubebixikafo.pdfIn PDF document text
    • http://asustainable.com/global/file/gipulaj.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/puwimasigib.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/tanojadugavatitofutukup.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/pomaguzujavabotorapo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac2cbf8ce---vazenogedavan.pdfIn PDF document text
    • https://anfauglir.com/images/file/gifix.pdfIn PDF document text
    • http://erex.hu/upload/file/25255928202.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/25660985860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gta+5+lcpdfr+mod+xbox+360PDF 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_off0000bf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 11160 bytes
SHA-256: d4c3f241a043c3b799c15feafb3c6e12e130d276800e86705e1e5efd2442e6b6
font_02_sfnt_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 17472 bytes
SHA-256: 8b90c203a5be5a259d878157173f514b5462f7be835d5186d9719f7d3f06451b