Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac5ae1b693b17d9…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 08:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecf02a6ecf4b1df4efbfb89bea5dfd03 SHA-1: 1d5acdff47d6a0cd0007637b86d3217c432c4beb SHA-256: 7ac5ae1b693b17d9ca3f0f0a592c7625f2b996894fd03a751ad7ba4e89d54dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a776460d904---zamunudupevoroziruwu.pdf In PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/664c3917e7f1b315f73f16bae7beebce/gapokone.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/romer.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/31048572276.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160e349074f459---fawokosilo.pdfIn PDF document text
    • https://epiphanych.com/images/file/patubatubidu.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/3996212559.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7af9c69089---dolitupumalezaboromido.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/21991653567.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/86865736062.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90dd92de2---sibujefetuden.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/85b18e4c0af6e61b16c9646450d862ab/34402344711.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef9e4aa75---xenos.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/japevikobobiporemob.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/67405958098.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d4c69f1e---93167808369.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/abaa3b53ae7f77f0bc5fcc360903560f/85002924324.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609403e407370---wugowip.pdfIn PDF document text
    • http://etre-belle.su/images/file/lazowun.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/31307635442.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e58ce8c212d7422e761ff98f9943b0e/91461739936.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/91309878046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gastritis+aguda+definicion+pdfPDF 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_off0000bbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE3 10888 bytes
SHA-256: 98ea7b6cf64a8c57f3ec9850c50c523d0aa54a16d021e78e5497a6b828cf3e7a
font_01_sfnt_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 17220 bytes
SHA-256: 6ae914fb24e35a64d91de03016ad372b61e59200102127d758c8fd4c5411d048
font_02_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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