Malicious PDF — malware analysis report

Static analysis result for SHA-256 d586826c1e004de5…

MALICIOUS

PDF

68.2 KB Created: 2021-09-10 11:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5035e7dc3628459e1511d4df4c0a064 SHA-1: 73c063122a2663d817d7a0493236f375a7bdd385 SHA-256: d586826c1e004de5d86abd90e1195c0c76eb3d599116492efaa58a3d43f3bb6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://graveyards-fuj.ae/userfiles/files/24126873069.pdf In PDF document text
    • http://ministerium.pt/files/26227003452.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/35617709909.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/8670032666.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/mulalalelalivam.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/lenabipaworaw.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bce3700810a986dc056d2439255b98a1/39178468948.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/puxip.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/7248829304.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161390d5381b13---fodepomerusalijobazijadi.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/52650979769.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/37038628271.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/tedenowidalufele.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/vomutamufikume.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/mivonafojedel.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/migame.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/50454998737.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/37794008160.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12fb0b0ae---motatot.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351232d6874---xomudegunexu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fujowokadinizadejuli.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/xikaku.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/12915836768.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/51739319997.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/8896322357.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/mevofedelatufasimonutesam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=apn+download+for+androidPDF 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_off0000b10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 10160 bytes
SHA-256: 3669150382e06444c7f75284ccd7395c757b510f38138e22cca385f494b10df4
font_02_sfnt_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 14168 bytes
SHA-256: 7d288969524ea1d86a95ee196813ec91754d8d79a3f85b11e53c01e6ab22b9d3

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