Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21bdec007faf46c…

MALICIOUS

PDF

158.6 KB Created: 2021-06-28 14:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 39f7a64b5a47524ee897375b17f886fc SHA-1: e7c509678f2c27c98bb9e106fb3afbd46e542972 SHA-256: a21bdec007faf46c6591f9284dad179971d0472b1ad3df7d2517e8cd22a1c528
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for potentially malicious purposes, such as phishing or malware distribution. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.
  • 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
  • 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://phunggia.biz/userfiles/file/79589928749.pdf In PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/kasurefipikelixizi.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607519afed77e---8739919702.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/26716283428.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/37838889779.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/sadajo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5e241faf6---72442559102.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d3a742eb22ef434d4841fffd5a857b5f/34904643019.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7f3f49ea06efaf2ee937ceae449f58e/39161076189.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/l0hb7092964t3bonel4avsi7q1/30918889111.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9032ddd30e---vilogobofiguvudilaso.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/mobip.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b806ab5185---40226499654.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3650ea34f51298bd23bd940075464847/32850235589.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cd206735cb8f7f5ba1fe56d96bccb25a/13588873337.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5d9a174fb58e4df2c2feaf596cc109f0/bivugamefimadiwa.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5nbsn7mnp5bsjge6h2d0ujjs7o/24943426754.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/dogafoxarezepiwuzajez.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/71193445565.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/rudezafunajinil.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5399f1b2a---77985705877.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ctcs841vl0pjv7scavqtb1pg8o/12684568048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+quickly+can+aids+kill+youPDF 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_off00020a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A29 19612 bytes
SHA-256: 2cb40bae84ed60a006dbf57a0e737a8ead5e046069f4fbf46104abd463eb706a
font_01_sfnt_off00023d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25567 10564 bytes
SHA-256: c54eaed5aaf6ec4412e31cd1c79b4663c1db61e79fad7ed9ec75616f40748e8b

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