Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3b528a87bc3cbd…

MALICIOUS

PDF

93.1 KB Created: 2021-06-29 05:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 125b779b59bebff49b80afda4c31a645 SHA-1: 96f3a9bdd743f1da2ed3e33ea3ea24541526f73a SHA-256: 8c3b528a87bc3cbd40eee2315bff43afefcd56c5eecc4dc538865e827da1b5ee
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, distributing numerous URLs across various domains, some of which are hosted on compromised CMS uploads. The presence of these links suggests an attempt to direct users to phishing sites or other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://from.ua/upload/articles/2021/06/16/files/nebugodapazij.pdf In PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/t5j8bse18t19j79b9le3brp592/58755087807.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/pgjts0k4clsqg72e01vhd4jeo3/25977743401.pdfIn PDF document text
    • https://unosms.us/userfiles/file/90111007881.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/ritetiseforigus.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/16333097110.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/vopajejuwinogusefufezo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ee514b886139e539fe8a6134f4ac8818/besenafanupatuxaboji.pdfIn PDF document text
    • http://tipiland.net/upload/file/35348147943.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb24b9a77fa---68219026323.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/70e42fccf77234a229869c70117caa63/3514988914.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75fd69c74---nuxokevunewumokusakekig.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/dikofa.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f3c4a1c9f---vekev.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0032a37ef1---pidapuwimiper.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e77a4011ead01df0f99c7e1cd729f2dd/sabugebog.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/66d469032b52432befc30357dfd10577/mivobufizirij.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/wopekuruzejab.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ec4112747---rujowikivisuvemunexogi.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/1523861741.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/57c63280020fe78fa85f650debf1401a/mipitumuxumigiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=new+hairstyle+2020+boyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 18172 bytes
SHA-256: 1a857043d0e6b78f006c21137cbd5c8b4b8b066abbb3eb13e8bccf731955a795
font_01_sfnt_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13827 10660 bytes
SHA-256: d144568957930c19a2b4ba0a675476a66b9b95bbb6c2a0d29346ea4c40fc5ce2
font_03_sfnt_off000150d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D3 16376 bytes
SHA-256: c0ce40a0db5da46198e8a330e54b405f016c0121b1c9e2ed55fd47191f7d331c

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