PDF malware analysis — malicious · b5b95e4f4750896a

MALICIOUS

PDF

94.5 KB Created: 2021-06-26 06:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 3e8b81adffab39627e0f4569f37efae2 SHA-1: d5d68f58f68532bdc875b57af7b90b8d224f495d SHA-256: b5b95e4f4750896ae04db81ee68cc8a40003b0ebbfa3d72990a055d19ff76721

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure that would likely lead to further malicious content or exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/r4dh21uvr640k4quolphe2me11/nukivu.pdf In PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/cad3963019ab67599585ccc31d450296/xoweterojurawajemez.pdfIn PDF document text
- https://grandplaza.bg/uploads/assets/file/vakeviwiretazim.pdfIn PDF document text
- https://rabudiagnostic.com/userfiles/files/defawijaduw.pdfIn PDF document text
- http://topas.lt/userfiles/file/829381515.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc61f0693e---46741359651.pdfIn PDF document text
- http://faradbox.pl/files/file/32552292178.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c6a78787c---pejuwomezevizadevepukozu.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4636471fa---loruzuguv.pdfIn PDF document text
- http://myshopgroup.com/userfiles/files/87823941136.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b3ff32aaba4655b96700b63ee9aaa55e/mopike.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/597d00cd6e920f78aaa4c490541a6db0/34488791650.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83cb9e95b---16848917085.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaef43b51d---21773963929.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d223117bea---xisukipabazasob.pdfIn PDF document text
- http://udaybharat.in/ckfinder/userfiles/files/68160545180.pdfIn PDF document text
- https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/aa1d6102a99c2e10129e7b91376a1b42/34281956567.pdfIn PDF document text
- https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/da0srk7gi640s6d34rqq4oisvu/gojobane.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6243d35269---9986059320.pdfIn PDF document text
- http://rld-carbon.ru/file/99924071082.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160858f16a3bb8---53617471244.pdfIn PDF document text
- https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5a107kgae6455l1ejj6gtbbpr6/1490487523.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ca368fef---33153470493.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca511aa9ae6---mawimipu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=types+of+intracerebral+hemorrhagePDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off00010e47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E47	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012659.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12659	17176 bytes
SHA-256: `abca7e10fa63cfd04a25b6260a4bdae19a946e3685eaa3ce02f2b876bed577d1`
`font_02_sfnt_off000152de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x152DE	11144 bytes
SHA-256: `163f054444e69439a05c11a487517d1b87ca1563a79445f90a87929065bf49be`

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