Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8a9fa88db8567e…

MALICIOUS

PDF

86.0 KB Created: 2021-08-19 13:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: cf44d56654077249b0954c360d2374a0 SHA-1: a1790d434cffe03d22e3291aecadc42503be156c SHA-256: 7a8a9fa88db8567e4d94603c9a2e51a830ab0fc3fb636fa5a84f726ba2649bfe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the extensive use of external links points to a watering hole or phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/30cb0ba5bd7b75b113072450cf1e41e4/60098042761.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6157fd3c41cb950e6bf2ae074525448a/rebazege.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/40d4deeca9e363f77666a888f6d85571/sobizudomotowasidapuxol.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/46041416933.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tisinowalejekazumenadoken.pdfIn PDF document text
    • http://majesticcaliberenglishlabradors.com/clients/a/a7/a77fae3751d16767b5fd1969bdae34dd/File/1951451332.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/nojagajitorifiroxe.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/sorujexupogulomebisesox.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/82075658551.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/51125797779.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/66594619623.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/paresabujopikisaniz.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/040c63965d46d47fd5a29e0160b840b3/kovajajetimoroxiz.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609165bc1db11---zafamofex.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/besiwinis.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/tipigime.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/36453053633.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/49f6f8fc416c79607a329be3a70a79c9/tozinefudetugesarorexuko.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f814ab5e4c---27796985130.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/tunagavuxunikariruruj.pdfIn PDF document text
    • http://euro-ex.com/bemufaxipudawes.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/poronajigefilupomol.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8ce24fc4---71966719803.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c117bb12ecd---1364605177.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddad0c7ba10---befatubowufosapojis.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160878559d0216---55351259425.pdfIn PDF document text
    • http://modern-pro.ru/files/file/46833988584.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6786714d8c18de73371e9e2d1d766b9e/sevuniziladorunufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tom+and+jerry+movie+release+date+amazon+primePDF 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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 18692 bytes
SHA-256: d38aeccee6cec70f91fc5475cdfe983be71e0daf4677720b2c38a74eb8ad9f73
font_01_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 10884 bytes
SHA-256: e47fdb79ede2c32e0a9f257223c6efc094fdb748f3482a482fc76efabacbefcd
font_02_sfnt_off000131a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1