Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51377a42b515553…

MALICIOUS

PDF

83.7 KB Created: 2021-07-20 22:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 39ce1f1deba2623ab1f0bc836cff7b4d SHA-1: 603495d52d9905a35ae65919305c4bcc7accaea2 SHA-256: d51377a42b51555370c0ed7783d22d435acdd58b7c34b34ef3b71869f8b935d6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document's content, though heavily obfuscated in the provided excerpt, is described by heuristics as a lure for remote-support tools, which is a high-risk activity in unsolicited documents. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest an attempt to host and distribute malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de881fbbdd4---zulekogofu.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093351a6ddca---10862087012.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd58fdaed3---69714854732.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/26760645493.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/63sclkjnr678a0a07j2i8gfh95/xivatefirodevozuvedatoz.pdfIn PDF document text
    • http://www.520amis.com/upload/files/7079728480.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e679e86a8daee9099ce11ed490afc0ce/vuvoneduwibidiluvebedi.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/936799254.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/e42vlvg458npoqte0kp1tilqal/goxugop.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43c3d378ac---kinobozixitugi.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/mifesexogeja.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/naxakag.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/617619f3dc55ebbab51bed6a77e8f036/71759605797.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210714_CC526E873F108B42.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/66694706901.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/xubos.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/86c757b49d71ed084bcc6b19803eed4a/63173239450.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/vumejuravanubi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/90973140765.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/dawalaruvokebowutekew.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d10f0a2f3---xipaparos.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/h99l2st2va5lqr2nijivb0aptd/57105899159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=primitive+and+composite+data+typesPDF 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_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 16900 bytes
SHA-256: 8a15462dc5802919901cde9a952ba3517eb0b7b6b070837734b95dd93cdd3dae
font_01_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 10808 bytes
SHA-256: f21202179f9da5e3d03666db3d6699f3dc4d0d41408da8ae2370579a9167549a
font_02_sfnt_off000127e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.