Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f5dab14f314130…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 20:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 894272758e72ae6bd53cfa84a5b6f69a SHA-1: a39fed38692c74c72a110d451472fc2c1dffedcf SHA-256: 72f5dab14f31413023359b73589d9f118f56b5f0e5df62fca196cad92ab59667
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://ketchas.ru/uplcv?utm_term=watch+punjabi+movie+chal+mera+putt+2+online+free PDF link annotation
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/latijukita.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/fozizal.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/mukebiforefototomuwanuroj.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/numobanitotidenolad.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/71286833079.pdfIn PDF document text
    • https://olterus.org/contents/files/dimofetuxiwi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411eaebf76f---fofemetipuvoxi.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/71461458332.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/vovugabi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b52c1ae8---36027078362.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/maxawamuxeputeg.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/lenenejowavibaga.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/24804234497.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/16374819774.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/18748243901.pdfIn PDF document text
    • https://ptogel1.com/contents/files/10521930253.pdfIn PDF document text
    • http://zenithmetals.com/files/gitowofuduwetifirik.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/lowojabeveragobajil.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329aa82d92e---dekirixewoxol.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/8939479714.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/35434354280.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/20987741476.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/miwusuvuvewikexerumemawaj.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161443c05b0f07---mivokox.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/48653694487.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/bokemomubumeresow.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/mozusowenegifo.pdfIn PDF document text
    • 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_off0000d12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12F 17424 bytes
SHA-256: 365e297f35b8a2cf0eeb2c602198431ccbc32f00bb26841ecb8794f4fcdb5a30
font_01_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 11124 bytes
SHA-256: 89e736a485a43f7d4932f6e6d93c361d9e3d08ec4f9a25de0e7a5f131287d624

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