Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d4222dc92d12ee…

MALICIOUS

PDF

85.7 KB Created: 2021-08-20 19:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 966c11a69182641c3862540f15949cf0 SHA-1: 6970855ef44b44b7639df0dc73a43c89ac80fd50 SHA-256: e8d4222dc92d12eea975929a01da3f16759571759b0ef92db6893cf5bd3f3a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware download pages. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=komodo+dragon+physical+adaptations PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7a29ac21---31468025482.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/tirajedisarorobu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/e20etk1ip07c56905mcsn0696q/bisajatositejo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ta4fknrl9ptpc3q3accb4hkt2j/xovefozabubomumusabawuj.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/54839932413.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/maxalinemebog.pdfIn PDF document text
    • http://bronia.org/userfiles/file/ketukiwosarafekijewamewir.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/87516231187.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/17394977738.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m1jhovvl5av7sqc9oiamtav574/lerijekugezofujejujex.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5ab2ba921f302f809dcd173e0738505d/70407528028.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/zanesisutax.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/19526668730.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/figejadogumategoven.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/14294950244.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/weginipiwum.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38bddc04b---tafileju.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2a70921d9---45163347468.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608405429a2c7---95932196071.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/520ae8ca76cb8ba1ba08c0208dc052c9/muzudogosafowato.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/44220518095.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21586748cb.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/an2inf92660nc58gmr5djk9uv1/6630656028.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/morejanipovobi.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/sanejakepu.pdfIn PDF document text
    • 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_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 16476 bytes
SHA-256: 1eb123ecf5b8542d44e425709a1df4d12f7f4eaa3d2ef6be61a083ab01d10f35
font_02_sfnt_off00013011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 10936 bytes
SHA-256: b94c175e87e584de80063ad36f08ab9a460fb587db8e619929e89620ac198b44

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