Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1116fb364660ace…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 13:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 26df24ecb2b9bebdaf7981c963e2230f SHA-1: 819cb36446c6b962f903d3516260aa809f4bc22a SHA-256: b1116fb364660acefbaab94e3f0da22467a20dd825677f54e0ca57d9b80e0516
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF's structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://detmers-kontejner.hr/files/62176988321.pdf In PDF document text
    • http://abwingsde.com/uploads/files/jikijiwifupoxu.pdfIn PDF document text
    • https://palet-school.com/files/files/66031956314.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/62838417482.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/mopegiw.pdfIn PDF document text
    • http://tiquital.com/documentos/file/kigusanomuj.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/sabizuniwovosamaro.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/koledofamogudomufo.pdfIn PDF document text
    • http://normel.org/files/upload/file/merirud.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630728633_05f94d56ca.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/dokuketuxev.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lbrqfcjds5prsl8vhs8il5sq45/18248226857.pdfIn PDF document text
    • https://olterus.org/contents/files/18219799790.pdfIn PDF document text
    • http://reylab.com/userfiles/file/12173521010.pdfIn PDF document text
    • http://www.centralperdana.com/file/kukosire.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/ligej.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9548b0748---nikiliduda.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c221b7808---64767268216.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/zelomivudixuwavexud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1387dd14---354431627.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/43485678284.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/pewijuzebewaje.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/52607159615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=surah+al+kahf+arabic+text+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 19208 bytes
SHA-256: f058316a120cbbe1541197cc2270a7184cbbc01523680315567f43054dd01324
font_02_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 11144 bytes
SHA-256: a3c2136ee4f99fbe97615851ba0d5df805a3847a6b4e0bc6733393d1b83bc53d

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