Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a9578e3a27fa10…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 12:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9a1ee093e19a125410bf1ed33fc30de SHA-1: c9c04aec1ef64fda77f6b44be7c8529a832a5657 SHA-256: b2a9578e3a27fa10767247c6006dafa70992b1291a53017f6879a916ed3a613f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of embedded JavaScript further supports malicious intent, likely for obfuscation or redirection. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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://hondasushi.com/uploads/files/jikidekuxizovetaw.pdf In PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/faboriziv.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/boxugomorukiv.pdfIn PDF document text
    • http://metallpress.info/files/mobowijumegeliniz.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/mumubekexagimelisuvumiroj.pdfIn PDF document text
    • https://theipbuzz.com/images/file/8962510946.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2ae45f32476b4d0e002b7522f4297415/39312987920.pdfIn PDF document text
    • http://minerva-collection.net/files/files/wavulokejuvib.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/82433600855.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/sawin.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/texik.pdfIn PDF document text
    • http://terrietanaka.com/library/files/duses.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/35298652796.pdfIn PDF document text
    • http://hodori247.com/uploads/files/nodajelab.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/61150491636.pdfIn PDF document text
    • https://advik.net/userfiles/file/topelulaguteduwikaxogolib.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8d90abf0ffb37a2988ea4aa2b77e739e/72021117464.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/47349248317.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/75777993397.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135378d66197---bawako.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/rovigekozotiwojej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ullu+web+series+free+online+watchPDF 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_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 10768 bytes
SHA-256: b71bee1e316eb1d3584e03b4d9c05d096f021d97a440cc97c86196d2a10109f7
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 17960 bytes
SHA-256: a151730695a1df98a6c2c34bad1322ba89569ce3e707594d41122eaf5576f09d
font_02_sfnt_off000128b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1