Malicious PDF — malware analysis report

Static analysis result for SHA-256 6519ce5b4b41b03a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 00:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd55e3d0e250d3a8c57bf26fc0b50a36 SHA-1: 790998fddf1b4c02750f5726849687cc7b9fca11 SHA-256: 6519ce5b4b41b03a08e7f561b0ef9e1adcdc0617a092fb48902946f3fdecefdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to trick users into downloading further malicious content. The presence of external URIs and a link farm indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://apluskleaning.com/admin/images/file/sidivevo.pdf In PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79ee85f2f---74937902444.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7475891390---zabunobavilikexupesafo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c9be3cbaa---nozikabejodekuzegexoget.pdfIn PDF document text
    • https://migger.dk/userimages/file/80929211623.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/xuzuxuxunanamofokafewojam.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/zuwasikimagaxuwagewolumos.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/19422628932.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/5114100995.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8d053b7028dc786a1c04b7643f2e961f/xikivawi.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/7747148234.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/mowosax.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48eca50e3---marogotudobikafuta.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/pikizarevewibifug.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/46626556272.pdfIn PDF document text
    • https://nasikampung.info/contents//files/47836306868.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/68902537289.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/13107919918.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/48538497305.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/zejuriruvilitetef.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed49b76d87---nusuvenobi.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103097cf06b3---62713215063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=marvel+encyclopedia+pdf+downloadPDF 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_off0000caef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 18328 bytes
SHA-256: 486bdd78c1c0152b2cae6230e98b9ef720e8a35a731c62845037c0e6e696da43
font_02_sfnt_off00011339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11339 10604 bytes
SHA-256: 46390d0ecc939bfe205b0d24b35476317a3c3d82906040f0dfbdb8e09d34c004

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