Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b65d6b189c0da22…

MALICIOUS

PDF

86.0 KB Created: 2021-07-04 01:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc5faacdba3e9764908289bb80d7bfdb SHA-1: acdc2bba47ae1927f442737058651c33b64cf6c7 SHA-256: 5b65d6b189c0da22285324c4ea4695bfb4bba00e15cda1c1c60ec681fab2c40b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://consulcongress.it/uploads/assets/file/74191600293.pdf
    • http://inimtrento.it/userfiles/files/niminarugugisu.pdf
    • http://bitite.lv/media/txt/122/file/45211346906.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607767a9845ba---14093917502.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/mehuhkhc61mc2g8m2ntmo9hdo1/wuronerivubuxotuxotaja.pdf
    • https://menu2uplus.com/images/file/xikizejigofekadefujasuxe.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707a3b379d3---xawokez.pdf
    • https://tskrea.com/userfiles/file/6387311438.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4126aeae40---xipujabak.pdf
    • http://www.lugashotel.com/data/editorfile/sitenalalowosureka.pdf
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/66332607078.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4ea28cfc---95433690573.pdf
    • https://efnnma.org/files/file/21472475415.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad3fe44af5911a0445ec0e7e899ab93d/15217328005.pdf
    • http://www.urbanwaterways.info/files/40832333120.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210516164234.pdf
    • https://acryl-bg.com/userfiles/file/musugafaxoku.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92febaa09---34018365241.pdf
    • https://fruzsiflame.hu/userfiles/file/fogemeramujej.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ca8f125a940e4d3265fcabd8ab664f76/mososuliloxagurefonuvowo.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/619bf6769a794783b316453197be1386/rediso.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5e5d3087a---zimupon.pdf
    • http://remaining-mc.de/userfiles/file/vepumotigik.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b3206ba61---zawabowitogife.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=teachers+as+cultural+workers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16792 bytes
font_01_sfnt_off00010678.bin
f468d8872f78ee970346ba816d67f3f9c059625bb8ac48f88299eafc7eb27702
pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 16936 bytes
font_02_sfnt_off000132a0.bin
91a264f5c7b8faaf799f9cab23cb208fe06d5e139d3957cb3c707e706daf92b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x132A0 10372 bytes