Malicious PDF — malware analysis report

Static analysis result for SHA-256 72048f7ec4b2c6ba…

MALICIOUS

PDF

109.0 KB Created: 2021-07-04 11:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b91f5b003cfbc7d69d186f981783e6c0 SHA-1: eb4c7ff405e180cd45da4228234b0c8857f88b3d SHA-256: 72048f7ec4b2c6ba3fdf230af298487a2528213a1d96b09ed6efa33512f0e45b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various URLs, some hosted on compromised CMS uploads. While no executable scripts were extracted, the presence of numerous links and the 'SE_DOWNLOAD_BUTTON' heuristic suggest an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

Heuristics 7

  • 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.
  • 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://logistra.fr/ressource/site-image/files/66168869509.pdf In PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/33218608550.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/14517236185.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/70830322911.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/zudilimowuvomopibevapuw.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4703dbe83---76622475320.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/89478956297.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/jggsj31lvmllo8v4pjqlte6erc/vudojatabipigepizomej.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/33310660686.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4c84a5e9---607951637.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6d39ce443d1f2bd3aa5b1cf10dccc26c/23300249170.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070f04ba1176---34376784663.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/gizeziso.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q63soaa7olih40i033im58ed83/23064303390.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d280e0c536d---kukokin.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6bae35e8---93022109737.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/abfb5a63938dadc6fdf7f69b65aae389/tuxebojokuzul.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba11d249a---gexulevajuwanusepo.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/xinoxewixadixuj.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3860909a0e3f500585adf68bf8ebc337/58517425154.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/p6tj2iraqtfnjap1suvl9u7ol3/vekume.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/nitakejixo.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/cb1baf2daccc1d7a6652f9de6b14a7ef/lunomegugosepev.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/tosojon.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b964ef686---mofitazifopubu.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/12616254894.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/18070031264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stress+induced+svtPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 17988 bytes
SHA-256: c007c07fc81bddc02dc6f96175484f74d784fc63735989c47355dac356058289
font_01_sfnt_off0001618b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1618B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001799c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1799C 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_03_sfnt_off00018f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F0E 10276 bytes
SHA-256: 1248996d9d7a244bb6ae3bbf8669b3b78f885ff6154864f6fd58e0f242fb3c96

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