Malicious PDF — malware analysis report

Static analysis result for SHA-256 d524a4d63a64bdea…

MALICIOUS

PDF

98.1 KB Created: 2021-07-04 20:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b8dd64359e7496dda4ee46b3666356e SHA-1: 6a30cab209f28ab5ccab9ed15ef1a7497443f9f7 SHA-256: d524a4d63a64bdead91249636a2f70ede49bd553112db9f75870ba7e6f9452e1
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple domains, some of which are compromised or use disposable hosting, suggesting an attempt to distribute malicious content. The presence of a 'download' button lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alakharia.com/public_html/userfiles/file/26129248937.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8150e9a68f25a36f33e318b4f04ac151/nerigafofupazoberajele.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4jbh716jh6nhn9pus5a9i2psl/saxatarefitusesarixas.pdf
    • https://alshaabcoop.com/userfiles/file/madukiwejefabisifodan.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160de296f33daf---64373558053.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d8dcf46f1b89a8428fc37806d3e97069/582522853.pdf
    • https://dodatnojamstvo.com/userfiles/file/zobowikixulugowifulizor.pdf
    • https://menlopark.com/wysiwygfiles/file/60252253682.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d63e76e5382d13b5da2e2cff4ede7fb9/40431247589.pdf
    • https://alshaabcoop.com/userfiles/file/23717752401.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bc29fabd4f4a6fd681fd0fbf1c4b555/23400133554.pdf
    • http://logistra.fr/ressource/site-image/files/rofugomuni.pdf
    • https://juraganmonyet.com/contents//files/busogisaxasexa.pdf
    • http://sinproval.it/userfiles/files/livovakuzizatulewonimate.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/fizesefiravebixo.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/45707346153.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7e23578d---74870278252.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbef0c4b74---tipabaviwumo.pdf
    • https://soechi.net/userfiles/file/kelekobivadanedix.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc84c82f7---kaguteka.pdf
    • https://led7.ru/file/6968325326.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/75094986638.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/4qdhsqfir3edijmtmbfbgben20/36099871303.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a79d9e6f8---17214624446.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b5e9f7aa922c6899d95d0176539595ad/jajisoge.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=computer+science+mcq+questions+with+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011759.bin
e086e3fce425a179f73d6a7298177c800a4615955fb46d49981abede174e8fec
pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 17860 bytes
font_01_sfnt_off000146bf.bin
58455e7764dabba636e6c4344891c4fdbecc6c3564374a5f6a4cb455904c0dfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x146BF 11204 bytes
font_02_sfnt_off000160aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x160AA 16792 bytes