Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a14f73f2670812…

MALICIOUS

PDF

73.7 KB Created: 2021-09-27 02:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6d7f06b996dca98f03a25a2485d7c18 SHA-1: 918f8553d7a1be08b18d553cc7ea9daa620c0373 SHA-256: 13a14f73f26708129391c6eaffa3281da733b25a4a3234547029c718ba079f65
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm. The embedded URLs and the nature of the heuristics indicate the document's purpose is to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://abwclayton.com/uploads/files/dafokefogomivekideba.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1de80d08---rekuwefiroxesisaxuliver.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/jowaveluxemojesodilarik.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ff91f266---tizinibafozowotunuxo.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/84813611889.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/73587108195.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc2b8e700---54077294415.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/4017673654.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/92488446520.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630482673.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/retenobon.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/muxiloxuxusidijog.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/78374440254.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910093622.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210917181631400.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1761a515e---nijanidalumirorowoxoriken.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/mawenosuvufowozosow.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0099c1b43---20100973735.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/duvibokudidovivug.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/48346298647.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/gefuzidikubatowef.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/rosukupuf.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/rasirodejejagulurirof.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/81337799155.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/65600101205.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/durisenalupizudazilowef.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ffc37ef07f---16983474993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+set+caller+tune+on+android+phonePDF 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_off0000ba91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA91 10788 bytes
SHA-256: 5f3546675fda504539da9e0e0a67f16def372a37fc0b27985b6795f3314a3373
font_01_sfnt_off0000d359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD359 17952 bytes
SHA-256: 9ad29ada063bfbb2c0da4478004fab748285999db028ecad1811fd221b2f06c6
font_02_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.