Malicious PDF — malware analysis report

Static analysis result for SHA-256 5560c40fc3d9cfe5…

MALICIOUS

PDF

68.9 KB Created: 2021-09-07 22:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae50f1656154f84a50968a5ae2331e78 SHA-1: f62fe1ad88d6646c47890e67fd9798009f82582c SHA-256: 5560c40fc3d9cfe538b07a1c5e282cfe74e231afd743ff573b708fcc64d206c7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. Several heuristics indicate that these links point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9396de7115---98761937779.pdf In PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/nibegilaramaxopiwosevis.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ce364748---nokofuwut.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/95322985379.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/55766275932.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608948dd3b731---jifiku.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/kadarukukopo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096957be6b36---vemenipobuva.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/39bb210ac76559b1d39d5c69a8f11e89/36430904673.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/02779923f3bc79499073be7bed139512/76779221203.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/11534642943.pdfIn PDF document text
    • http://bwc.lt/i/bivatimipufurivibivik.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a2d1e263---96442338732.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/87d1747895de2f752b10b36c5c99b5b9/28111674760.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/90410440638.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/44495449920.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/krpcf4kfbrn43njr672bhpmv87/vemitagafokup.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f85466315---galutukegaxogux.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a416caff9b9576041cc4a093013e5a15/tulito.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f11092889302a332bae81dec5d52c212/80584469797.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/16375359073.pdfIn PDF document text
    • http://4bx.pl/public/file/dokipelugolajugorafefe.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e974888d08d---zulotekuki.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/30227387861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=synthetic+division+worksheet+with+answer+keyPDF 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_off0000b201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB201 10856 bytes
SHA-256: 5fe468bcff381d64ca66dddbedbcdaee8e9c4e4a0e83f4b82010c167f8bc6f0c
font_01_sfnt_off0000cb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 14060 bytes
SHA-256: 33ea4148e0fa61ab9a1f6ab31be64f8c5a954feafc1648eff5ba990c4aa77f10