Malicious PDF — malware analysis report

Static analysis result for SHA-256 893ff326b87630e1…

MALICIOUS

PDF

88.4 KB Created: 2021-08-09 12:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b096469d3b6f252784a9ae3cd02547ad SHA-1: aac759f7ebfa3c2f26caf00fe7a39fc1321d4e56 SHA-256: 893ff326b87630e14a0cc8d64e7c7ee7e7aacbfb3a3637707fb2eaf056dc62bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://nomylo.ru/uplcv?utm_term=tai+chi+chuan+48+form+pdf PDF link annotation
    • https://invest.pl/userfiles/file/97430170693.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae817fa8f24---bosebijapuwupemu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41fe5ef91---bumojavenabomade.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/bopavila.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f35322f4---dezidabezos.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mudixijo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/84n7b3p9uaubi2kep3nt3on7lk/93649645415.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/xixikemozekiloba.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fad8e05b9---58973811088.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d7d8ae06---garobogozotew.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb9e362f3a---992898519.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7abce789fc---45385039672.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/30383620211.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6e35d9db507bb63a3dfa6763ace6fdcb/moboxudopala.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/kizagajisilowapisex.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0efc95bfc167de0f3ebcd267146653e3/dulopinakebaxu.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/13210333735.pdfIn PDF document text
    • https://hse.tw/upload/file/9263031130.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b58089a24---namukewepum.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/928j5vr1r021h9fbiloo9glsij/9769784695.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2d72bfa7---73956950012.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff09778e1---suzosemeronatifazix.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/l8pumpfvleb6c74mvhjosfb5co/74361772291.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acc96e8a942---41428909367.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/vojijulezigufa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2be16e4374---lawawuxafisekofojexev.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/29422537151.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_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 17892 bytes
SHA-256: 2768ef24e94906d26ba5370b1c59028808d2802aef57f8b8041fb1de30910258
font_01_sfnt_off000123bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BD 10788 bytes
SHA-256: 6367ffcd0e87426f170d2115bb953def153cc362bee927b2a66e2fffc13d49e6
font_02_sfnt_off00013c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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