Malicious PDF — malware analysis report

Static analysis result for SHA-256 1493a88ab9454060…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 08:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 379a0ea65a6fbdbcd87a25e65f85c496 SHA-1: 351b969764f4c49989174b546f6cedb3ea4feafe SHA-256: 1493a88ab9454060ea9b92dc1a7c0972caad0318e814f8b710d3974b829c38e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c669f955594---91945904937.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/8548229895.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/51118719676.pdfIn PDF document text
    • http://adveotec.com/img/file/vuregosemomavunamimibeboz.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/zanotorepusovuber.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/fulakenujara.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/558a36a05a56769543a6f8b31a1c92d8/61844062825.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099734076fc1---15223074396.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92707dbb4---36318221237.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/12e8gm9gqbotpjfghktg7lddjq/7134527393.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083caf4cde93---sutoxajifutajobixifewega.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b12b4128c5a1f4f14c6f5524fb39841d/66073726821.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/85493093749.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d039d4e3de7---33409324208.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612b46c39f0b8---20658197237.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/kejavaxunutefi.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/wuwuzep.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/89135269795.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/92506182855.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/n3bh43icd09ppt64bjd4q3kml1/24485686452.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aebae12d9---43067180842.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b34bada3622---94763621240.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/rumaretukotefovuguko.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070306221860.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/3f2886e17c6b33ba025c76b756be4846/19110717678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+way+to+freeze+pasta+dishesPDF 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_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 10756 bytes
SHA-256: adb2816fb0cc2555d36f734a5081529a514aa39b3f23c6208d8e8ea5e9b2cccf
font_01_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 17664 bytes
SHA-256: 532bdee08c08cc2a3b6f2eefad3ff4368c4319632cc9aaa8cad3f70dd5c180b4

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