Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb5546f241a3e78…

MALICIOUS

PDF

89.3 KB Created: 2021-07-26 00:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1913e531b6bd229c9620d49fe165a79a SHA-1: 6df5cc423846ac1221ac3b5500b8219ea9c0c6d1 SHA-256: 1eb5546f241a3e78273ccae81de0a5a19fb22819958a9965b6dd7e478d7e81b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly suggest a phishing or malware distribution intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://techbico.vn/uploads/image/files/80979592427.pdf In PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/45278891606.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081619c672ef---zexolukozinowipiwuvadazes.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62d7873cf2---14494081391.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca78641b86---93025228586.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdf58763c---76668868958.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0f582c07---lujeturevixamokoka.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/xapex.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/70391008286.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fefebob.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kukaderuretanexizododila.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/65282033151.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/wetolajujizokanikepe.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9455cce242---11523204693.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/88994145200.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160702cdd72a05---bijefobepig.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/90000222687.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/85420960771.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/21299641984.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/be2543684ed8fb0e7f9c691c681c5d05/7025135758.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/72rgfrs7t3noad26p0cgiuqoc3/30497239494.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/69755874075.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077a253be826---50599197817.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/31825265943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=livro+clean+code+portugues+pdf+downloadPDF 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_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 11004 bytes
SHA-256: 1b6868bf96342698ec7de277c020d17283e0a3a7204f992b06ef38eb56da89d6
font_01_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 19176 bytes
SHA-256: 492ade4031aca51b0969373bb1e85dcce9f841375bd0603556e2d617e6829363

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