Malicious PDF — malware analysis report

Static analysis result for SHA-256 453cb9bc71b8f308…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 20:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14d6c755dbb1e8309342446871600a46 SHA-1: d279e0bbcfead797444ed79673f93f4aa5866b92 SHA-256: 453cb9bc71b8f308fb9557110faae751fa28f235389af2c8131bb17dd69f4031
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://drinkpoint.com/uploads/files/42329477274.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff533c2c940---62496277503.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/54111176186.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/geduduji.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608264138fea4---zekepusiw.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210715201622.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/josix.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/75243291490.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/mefuxagodeve.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/5368310024.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/sumowitedabulezu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jopit.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/97783869643.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/51875617677.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1dd129fe---62312123837.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f90ea93793---4763366699.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/b1a91bbda900c59304a2c63eb98b8e90/lepegiwidatewut.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/839c7f978e167fbce85a1aa514f3b7d7/mofopawabuxivobugabunif.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6828a83a---23634228761.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/fevife.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/cp3gtreqjsa47dsro5l9qli3bg/kifab.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d55abf656dff699afa8ece55f23261dc/bevobimibexazugetimig.pdfIn PDF document text
    • http://3asoft.vn/img/files/fobuvodexigabiwetevesavad.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3968c94321f6ca6a2dbc59184937b145/xopabadikaxikawaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gas+station+with+air+pump+for+tires+near+mePDF 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_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 15508 bytes
SHA-256: 545cddfa17c62f5ecc9623ecb5b74b408ef071e8f48822cb92dd1bce2b0d6e16
font_02_sfnt_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 10800 bytes
SHA-256: b7a43bb9bb759c6c802a55f2398add6b59388afc5c46c2715b326c63d3826e95

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