Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6b13a3881c89fc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 15:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5e41de38cd86c3fe8948aadab92c792 SHA-1: aa831755627c878b45a77d40f762780d34755f1d SHA-256: 9c6b13a3881c89fc554f426a3cede5151bd05e864febe9214013e87e22d48f99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites, that point to other PDF files. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are part of a link farm designed to manipulate search engine results, likely to promote malicious downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f74329272---72991201083.pdf In PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h75fq9hj6408m0vvrhbbk8rne4/muzusamusaxopalegureb.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/rasuzifasogafimojofegevol.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/65213646163.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/6980466301.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xezifizigegorifi.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/satexadejajexuresukowig.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16139498c6cefa---zigetukawuribijopibazo.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/mutamadesovasominuwelim.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/34783701926.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16131658e05e0b---vulirobomutigatit.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/pelexan.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210907230437.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/72578784766.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/36604647615.pdfIn PDF document text
    • https://digireg.dk/upload/20355747896.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/13030529714.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e0d695766ed6a183db6f12a1316ded27/82346178702.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350309c2ed5---92619391697.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/7740551411.pdfIn PDF document text
    • http://savemaxint.com/files/file/pikelemafugerex.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/060420029288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=photoshop+cc+2019+free+download+full+version+with+crackPDF 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_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 21224 bytes
SHA-256: c41c777717f3d1b042feab1bc7727e2ae332cbdaa96af58a8db4ebfd0992bed9
font_01_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 11524 bytes
SHA-256: 2c38af964238d330ff1472a2aecdb430f76eba8184e68265c3745e674507cbb9
font_02_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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