Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7548ccd02a8d5dd…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 02:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c24b34c2b43743d9411b0119aad64e9 SHA-1: 7d572afca85848eb4f9ea0f51de797a4c64919af SHA-256: e7548ccd02a8d5dd2e7b28e5f502da97f98b4136dd9faebacee8789cab36a5d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a campaign to leverage search engine optimization and compromised infrastructure for distribution. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=cut+and+paste+photo+editing+online PDF link annotation
    • http://drivingschool-brno.eu/files/9100379836.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9d0dfb66---kipuredimuwa.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/lafekajubus.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0d2bbf53---zazuwapuwefi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/fe4106a86e8f64307f790c0b693cc51d/81860243198.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079515d23ac4---mukixovidaxedasokewuminuk.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/19169630838.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0df2d1a64b---milimi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f650b1ca9---woralowowujirawezafo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c3b34b80a5f---fexomodotazejuvodazizamim.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749b7f4dac1---zetoganatoze.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/pizisavelovipu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/10360628525.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/kejedibatenadomuxibo.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/javaku.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/687224a5fdcc72dc9aa4171a14e95aea/93578051247.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/14843953988.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ae39cca6b---pexupased.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503192530999296.pdfIn PDF document text
    • https://castel.ro/userfiles/file/69760209388.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06714a40fa---zirasoviguwagadesibila.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/38216605663.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/53407840611.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/nefezotopuxid.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/zogomaripaxazifiti.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_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 17408 bytes
SHA-256: 0a855e0914a7781f3d97e63c558250b0c8f30c234edff42ed7ee9372df9b1e57
font_01_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 10704 bytes
SHA-256: f36c30101b74ed0df16eef91e883313d98c203de5a74a771464ada0bfa1225a3
font_02_sfnt_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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