Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e379b92ffe5390…

MALICIOUS

PDF

81.2 KB Created: 2021-08-17 14:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fff3e2beb8159835b4233e6e26869bfa SHA-1: 15192a2cdc7d7db6eda424af9c76046f40629e16 SHA-256: a3e379b92ffe53906b58e70868f4292569c17ff804511d84828bd98e3a1a5dba
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://synerhu.ru/uplcv?utm_term=how+to+cheat+pay+washing+machines PDF link annotation
    • https://anfauglir.com/images/file/zugiteremivemefin.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde8bc6e7f7---25357683507.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/f0d793f87d82c5c531406f691798decd/zaposivelabezepiluvotu.pdfIn PDF document text
    • http://vtaky.sk/media/file/76756186260.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a80eb557---59142289265.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/89036296011.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/zomuvejofo.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/99356879794.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/sixixug.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/japixeliv.pdfIn PDF document text
    • http://standdominica.org/files/files/38286113662.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c89208417---96176403573.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080b6dbbe01f---dozafizosudebi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f340752e993---redofegewumunarig.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c83844443---98462330351.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c42de04d3---duxewanud.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/78119110251.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/setufegovatarod.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/0b172224d5a1db10a9695cd0eb2ab727/wuvagipus.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/davigadaniwodiwaxebasefim.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/tvbpq9hblao96sa12ib7rg8g6h/66146617481.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/41073819260.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca86ea8dc---potegutizidet.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_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 16608 bytes
SHA-256: 34b74b56c8fbd64009a2dd49ec445b45a7f97910ebf925cbc9e1ee64054c315b
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 10864 bytes
SHA-256: 2e30150e3354cc17e454e3927abdd4de26daa7dec674deac813ed2caf29d6028