Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73759d3b9fdd0f9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 18:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97ecff606683078f6749d3a835a23401 SHA-1: 0595e21fe0a8b1cf4e991f0dc6eee36ee4da74bd SHA-256: a73759d3b9fdd0f9317b67291c4fc7fdd9ed864780a6128a3ad9a5fc6e5d3bd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chuanghuilaw.com/filespath/files/20210902182526.pdf In PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/kinozagojidunubinere.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c9ffb858ca355c590509ac55ba2024a9/74853447242.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-8/20210608135034516831.pdfIn PDF document text
    • http://ibb-online.ru/f/file/38854314625.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/97269576212.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a9febdca---40507424427.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c11a5a50dfa---xarivexeru.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/jagelobadadigugoru.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216271758249048.pdfIn PDF document text
    • https://onlinendttraining.net/files/jonumixapuposed.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/zawajaves.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/73935333642.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/92735231938.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/fivogefuvenifemedumija.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bd5c5318d---bazizagusidaxuw.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/98075930662.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4df3f4eda34f2ae57a60b45286595f9b/13174370582.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/af8ae0c82ae184c062b49ff69ffb6a87/9135715448.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e1dd5350755851039e8f37ad85441f32/16223861679.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c60db5c5de57ebe32c914d0df62203e7/zosiluvuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ggplot+scale_color_manual+orderPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/50ab18eaf7d920525ffd7123192af131/80297875388.pdfIn PDF document text
    • 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_off0000b770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB770 10936 bytes
SHA-256: 0fca010bd8df6bbdd26a0d8740e200bfd36746ef1091ece1708a4d2002459618
font_01_sfnt_off0000d0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 15768 bytes
SHA-256: e7f54379c488396dfd47bf3fd8dee11b1b47b458f2fc2b67154591576ed65825

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