Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47f17863324ab09…

MALICIOUS

PDF

102.5 KB Created: 2021-09-06 12:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a67f17bf003fe085746f3edbd0ee9078 SHA-1: 18c842a3fd8784d99b19aa111042d3089f5be8d5 SHA-256: a47f17863324ab091ed422b469acf2cbc7fd88ed1c99eddc3c176f5e072aeb73
184 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of invoice and callback lures indicates a phishing or scam attempt, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://santeh.md/img/files/saxonuvodem.pdf In PDF document text
    • https://anmoul.com/userfiles/file/77360955728.pdfIn PDF document text
    • http://e-sportis.com/images/upload/dabitewasoxavisuvutiso.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/japapen.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/217210ef74fee407f19180ddbc0a71e5/potopitedijapigolu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6417e766---51992806947.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b70a2a63a---72298041562.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/85483245653.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/49274958205.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/295eeb120146a0c38f34246f16410363/59070078056.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c24ad09ad---8023860158.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/98691486276.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/valebozetavidex.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610610a0aede9---22047413992.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/maxapitagosoradodusebosu.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/15518452940.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/litofifisogutemalipix.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8967ab668---xanasaverimamesa.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vpeirafm6ieeh44fqqki9l33he/paromuboninaberuzisevobo.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/25180462752.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/64408840800.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/t3q9pv9b7h3uqca241n41c2u0s/50585906109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=importancia+del+cliente+interno+pdfPDF 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_off000128cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 10564 bytes
SHA-256: c3313553d5171a1b34b21a4df868569dc6937ad31a1286aac6a1b7b59e7c0d5c
font_01_sfnt_off000140ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CA 20192 bytes
SHA-256: 227b799e4dde769a17354a68683d71eb84a50520a5e7f096c761f0f8d180940a
font_02_sfnt_off00017429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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