Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c8002380aca743…

MALICIOUS

PDF

96.5 KB Created: 2021-07-14 00:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ad4575557f0de8634b7cfaf8fdc8fd7 SHA-1: 10116f9d911906457ac506b86d94b41724de2a14 SHA-256: 13c8002380aca74330fc9fe14c656de278eb51a6e78ce572caf3f243cf7e9a22
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests an attempt to obscure the true destination by using a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3bd583d45---91438798381.pdf In PDF document text
    • http://acril.ru/ufiles/files/73809429892.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/9c65eebdaa6de99e49598c1a98bea08e/76050492168.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///jerukoduxapekemub.pdfIn PDF document text
    • https://dintek.eu/uploads/file/43385288811.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/vulesa.pdfIn PDF document text
    • http://yuha.be/_files/file/86226720940.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c822fd48a18ba27a938a367fb11c92ec/1477206312.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/64238316661.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/tutusetilunezowemamo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16087a959ecef6---tavusazowuvisagi.pdfIn PDF document text
    • http://garderoba.sk/images/_file/geferazekedusolulabopudo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b231adc895---lebadaxezagazon.pdfIn PDF document text
    • https://medtek.vn/storage/file/gavix.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/sifowujapimiruwum.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/94b7cac46c72c6f58c4a8454c375a1f7/vusafi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b68810a3b0---48507601554.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/47907496263.pdfIn PDF document text
    • https://songhong.info/userfiles/file/vokejitirivexutenakuju.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/51580086070.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f145018139---notofuvo.pdfIn PDF document text
    • http://martonelektro.hu/files/file/zejifazop.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/levugimenoxukarixup.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/80553841121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=jimmy+durian+orchardPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 10396 bytes
SHA-256: 585839ab3eff3e9b22ef6e3364560b082a1163176ab06086308c5cf1a7564de7
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 4532 bytes
SHA-256: 49c6c89b996603ba554d15cdde3da89a42c6289efa2f5168b5f13ad30148c049
font_02_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 16984 bytes
SHA-256: aad02aa42961a814d453f6039e599bf34f367d583d613217fe0544ee39af82eb
font_03_sfnt_off00012af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14305 17684 bytes
SHA-256: f461c712566c0c87b27737dc1369072262bf25d2134ccf8a74bdc573fcaa69f1

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