Malicious PDF — malware analysis report

Static analysis result for SHA-256 de228da69cc53128…

MALICIOUS

PDF

79.2 KB Created: 2021-08-29 13:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4375cf93545d5a88c36d1a6dd6befe9a SHA-1: 202f91aba6a39bde5443f70175c49803c16f8d5b SHA-256: de228da69cc53128bd3ebdc5075bd9d939a33f5e343d0357f257f7c232e7052f
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a 'ML_NYX_PDF_MALICIOUS' flag strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious links, aiming to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://synerhu.ru/uplcv?utm_term=intimidating+a+witness PDF link annotation
    • http://charmingcurls.se/upload/file/42624574862.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tabuwavaf.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0f00cb598---jobufaroweg.pdfIn macro / runtime command snippet
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sitonoroveratepujepapij.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c0eb61211---40710628058.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/taworapatilexavusigib.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/69c9b4003cd40e5590c2303604325595/rudifozolofonewagebedo.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/67587523779.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2f7fd90cceddda7e0658170cc65739d5/lowagesurivedevu.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210717193840264581ke71l2.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/9k1r61a2frp6vonvemt9vm0kq9/45063883062.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce429b7221b---sexezaruvud.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/75738699638.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/zukuzagoraliwem.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c4e25cdf5---29941009552.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/deponovamajepaxuk.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dfab25fc8---82060255279.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f6ff222c1495734e7399ea9666f7ef50/67990517303.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/56897010267.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/lulejudorazemupabifirunam.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/jipol.pdfIn PDF document text
    • http://chizclean.ru/filIn macro / runtime command snippet
    • 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_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 10360 bytes
SHA-256: b9d1faf28279e83eaae195c59ef28085849254ce105d1e3ea87685df5c9902af
font_02_sfnt_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 17108 bytes
SHA-256: 23f7ef2991d37a3b57f4f4b48d745b031bc6ff74ad4b6e49560b57f0a91558d6

Open this report in the interactive analyzer, or submit your own file for analysis.