Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5126fb70a3d522…

MALICIOUS

PDF

95.1 KB Created: 2021-07-26 21:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4ee85678cc18cad5d14dd8e5fbb6f0f3 SHA-1: 9f05a26178f1bccbeda3444a35bd59f3b0c463f7 SHA-256: 5d5126fb70a3d52267e391dd133cf46512a9b90918cb4abb988c714e7e3f1bf7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious actions within PDFs. This JavaScript likely redirects the user to external URLs, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7be812b76---dodefumipenuk.pdf In PDF document text
    • http://nextgt.eu/uploads/file/rivivumunitamikaredusobo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e606c116a0---43919107526.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4d201d9a---52146702465.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b983a2741e89c255578f727191585574/29959104350.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28421ef8c4---dipatemirizuxalup.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6abf2b41b---jovawok.pdfIn PDF document text
    • http://nensi.si/upload/file/fogosowigezanagukaninib.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/91bf16829dcd227e4ecceca27e666dc5/vatilakewetama.pdfIn PDF document text
    • https://webmenuplus.com/images/file/rejozugezovam.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/559beaec091067e0bf5e1c6de4a891d3/96962120294.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607758bdf223b---nanekoxabosusunaxewoxiti.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071addd91aab---titawo.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/lepukosuzomal.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8f7ca268---xisorevofowid.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d193202d---jiwudazazojodofagunoro.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/0b65b1db971718fd397bb4c31df0cca4/bururekiwofik.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/96894303490.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf085f29fc---22875969822.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6618eabb25b9cfc1e4f9e2098c32d438/69735012307.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0d1u9mmcaecj0dcarp0s3k7js/35118400306.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/66294609186.pdfIn PDF document text
    • http://msiutilities.biz/documents/54908966464.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/45732028830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=half+wave+and+full+wave+rectification+with+filterPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 10648 bytes
SHA-256: c11df73d8c56bd5cfde7715ad1bc2f0c866adfde71fb0003ef9e3cf2c52d6004
font_02_sfnt_off00013f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F43 17708 bytes
SHA-256: 50ef99c649441a87ecc079f9fd520d3404c755c697ff87d9a6c4eaff0a8af344

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