Malicious PDF — malware analysis report

Static analysis result for SHA-256 9243e310b16f4be3…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 02:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 802e363ca1fa25b355d8b978e6d997c0 SHA-1: e3701523d01ccbbd8bdb5ce422adbe5317dc5886 SHA-256: 9243e310b16f4be3853c1d47d35a68c8bcdf33bdb5e9d5e2f26d3621f7ea8b29
212 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination. The presence of urgency language further supports a phishing or social engineering motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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.
  • 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 https://rkdestate.com/userfiles/file/99651211602.pdf In PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/93402955889.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff505ee9e---xejilesoloxuloxixa.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/tobaroxefe.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/mepinizufalavasitodo.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/18020468380.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/jupasoxamataj.pdfIn PDF document text
    • http://webs123.com/userfiles/file/44110882950.pdfIn PDF document text
    • https://greenways.at/userfiles/file/594502497.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/19555190462.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3fe379a61a140acaf6b1764bbb28b943/wavuroj.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/gobotot.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/gudogalosetalez.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/fuvajirizere.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/resupamirofug.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/jofuvinipebelek.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a9f4a6f3b---torevok.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25374e2aa---34359145192.pdfIn PDF document text
    • http://askaudit.ru/price/93909183096.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/82473637744.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/waveremuki.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/pabig.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/36020679907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gangstar+vegas+4+indirPDF 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_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 21648 bytes
SHA-256: b05ae9ea17bb6b86b8fa21cca51d25e000e0b99765e7e22c6c2f7b3d729e0f74
font_01_sfnt_off000118c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 10440 bytes
SHA-256: d3b797b93c7ffff8beb6a6668beb4ae3158d3bef6631d1ba1af1f41104a3c309
font_02_sfnt_off0001307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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