Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a8574df91858e7…

MALICIOUS

PDF

84.5 KB Created: 2021-07-25 09:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e65b04f97e7d25b1a0ef6729efcc7032 SHA-1: adfcb13e67c2d45fb131d214a1255c9ffe443d64 SHA-256: 61a8574df91858e75a5916f133502be059b15c4891be3d9f5487f531c96be778
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a secondary payload. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent of hosting malicious files on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://akekaluck.com/ckfinder/userfiles/files/26117402180.pdf In PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823ccace193---24522312803.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e8f34f95559e35abe043db990c54183b/68345515980.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a512e5953---78626613808.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/98571562287.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/98593399605.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0dbc7915165e1904f1e09fe01fc4b6ea/82815341325.pdfIn PDF document text
    • https://agatanorek.com/files/file/fejidikov.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/97615989490.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/h4v87579hamj8883k3h3cpfml5/24724761117.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/vppd8n0vjpnljrktjrq0re0g52/luwuvivudoweteko.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/10879958161.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/wexozosetokipi.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/26022532312.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/xuguvexarabogib.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/395269fb04e5132fba1d4b9aaa5a0c61/gomijobafezepotuji.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc7085c98a---mekapujunasufidopi.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/33317650096.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/15831445872.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3e1e9d049a71e6fc71d5e9a13bebb21c/wojutamuf.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608df60f22fb8---61629583237.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1a983121---55685455478.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f04d48607d8---91351312868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bepanah+serial+song+download+mp3+female+versionPDF 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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 18760 bytes
SHA-256: a0107c11224b7d46f242738d2e92594bc53cb9cf57e05c474bbe70c2727219dd
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 11224 bytes
SHA-256: 0411632acab7437b09f31580f575124fa6fca694f5997e4e9f03c2a1e893e9bf

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