Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a3056894409606…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 22:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 340d489f01309fc3af0c6a52a11ce965 SHA-1: 3ffd0f58d8911d33246d1723d3ce03c1b4acbfee SHA-256: b6a3056894409606a49e5cc4bca0d0fd28ab7c33e1256f947e390bff577fb6b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • 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://orrizon.ru/images/file/19480916265.pdf In PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/c20585c969f5733454f7de0115104470/58538461383.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608030700ce59---mibexawofitif.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/29980450467.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/53f5674ceb0e97b9f0e9ca6a43648c5f/60250227549.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/42930326722.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/046250a5511c33e13bc7bbb43319f973/tadogusuna.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/93997938296.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/18104004653.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/31e7421a49d0325b5fbd3daf5e8bc1b8/22203322013.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/vujozixid.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/bawadeko.pdfIn PDF document text
    • http://salt17.com/userfiles/files/sedaboxofagepedosepulug.pdfIn PDF document text
    • http://firegallery.ru/img/upload/92865536612.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74853676726.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/47128485996.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097a521b2363---19959994314.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/12126156987.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/27150bbb324e29685453fbac1d32a4cb/88312733238.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a963c0670be---46429718763.pdfIn PDF document text
    • https://kawanmto.info/contents//files/sadomalevetatowitivij.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/33856173179.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/84762628863.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/7228570465.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/fapibunivedol.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/51601902223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=list+god%27s+promises+pdfPDF 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_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 10520 bytes
SHA-256: bdb2e25c89e02393ef92570ddf1082c960adb693ea5ed1eaceb0a0c7f8fcbd31
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 17384 bytes
SHA-256: 1a333e6c4ab71f9347901529565972ee2677b2e7341bcbd548f9733274b835a5
font_02_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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