Malicious PDF — malware analysis report

Static analysis result for SHA-256 5793b2a06c5e6147…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 13:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 18cca4555a8f8bf240ed5909a34ccc2a SHA-1: 172f88b1149248f7f1adcb8bec91226cb4866dba SHA-256: 5793b2a06c5e61471c8202a0a223c0e3480e47acc2863e1738b1072fc5ad0322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm hosted on compromised WordPress sites, likely to distribute malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to trick users into downloading further malicious payloads.

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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043b04e89a3---6325448782.pdf In PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/masaba.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/919f7f76fad7776caba77ab385871dc1/45253876792.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7bfdfad07c41265b96925b3566c82b96/24513529512.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1887eb0d6---5144029209.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/20491110036.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/fokowuvitukadejotikimufes.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mjahl9qv2qf1dfdriadl1k9snq/zidisuvopu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9087a80ba0---15202471518.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9bbd38fe4---tobujezujo.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/saramo.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/vugusafi.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/o3b2tkj56bhfkcq2knou6d335f/84820061862.pdfIn PDF document text
    • https://rm-parketi.si/uploads/tijelinevukinojexerugus.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/57048f1b9b64181b734b3f8a058e52d2/goduzizudipigebiteraso.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/durawebura.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/81563394085.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/24913123915.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/xenavow.pdfIn PDF document text
    • http://lactopad.com/uploads/files/83704955816.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56e0449fce50cca58868610b12c7fd1e/mujujuxidatadut.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/jukosusekugajiteseramadaz.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/jagupisafipan.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/45062409092.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/dawus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bajind+marathi+book+pdf+free+downloadPDF 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_off0000b8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CC 18232 bytes
SHA-256: e7dd9d3d7461c3ec6b1b55a5de5b66a157d728ba5c29cad8ed23b208894b35bf
font_01_sfnt_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 11096 bytes
SHA-256: 1e72dd1c982fdb3954a195f5825f71b511dfa8b09f4a26c46c5715f851ec8f45

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