Malicious PDF — malware analysis report

Static analysis result for SHA-256 4676f112c7a3ccc0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 02:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8098d5a6898112d0dd270e1cab89a53e SHA-1: 362e917a9ffeec652dc321776840710aa598b2f8 SHA-256: 4676f112c7a3ccc08ea43e4b8c6388380ac8ff9a514666e1661b3555b4b19292
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts for link farms, suggesting an attempt to obscure the true destination. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0544dc5d12ea9fb0a849ae6f02eb201e/xifok.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/divazatobuxa.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/lakokefa.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/9526c1a892e96cead689a11eb4b34779/wuweb.pdf
    • https://ost-fogging.com/upload/files/lijivelepuvirigibufa.pdf
    • http://fashionflutters.com/ckfinder/userfiles/files/fobegidulovazoxafojaf.pdf
    • http://lohs69.com/clients/82366/File/mimig.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7d34dd49---67274379426.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e8c4608931fd75eb32d5f3c1485acc7c/sejosekakikulafanupifakok.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16103d97aa6f44---gopokobetevuzetasirobed.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/21673844048.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c969d0650---5356374397.pdf
    • https://wildarium.com/ckfinder/userfiles/files/sakolaxiwufodefodoja.pdf
    • https://skvacations.com/userfiles/file/1394924081.pdf
    • https://rajakeempat.com/contents//files/41813048833.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a05rd0snii9meqkcqfuqmhoj4/diwatoxupisag.pdf
    • https://forthepeoplegov.com/userfiles/file/8141962298.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rts0450678v91mvue84lk1tdej/73636893653.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/46761860362.pdf
    • http://evpltravel.com/xv_image/file/sufolulebujesawuvonozaza.pdf
    • http://dspec-car.com/js/upload/files/xofilarenogajuja.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/medififanufu.pdf
    • http://studiotecnicomartani.eu/userfiles/files/73789387466.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/76146b641968b9855bca6e1061e3000a/4723486170.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=agent+in+place
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 16792 bytes
font_01_sfnt_off0000f326.bin
a3493dd41deee5122810b30a84dcdeba012a376dc2591ecb59a3cd952343af03
pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 10144 bytes
font_02_sfnt_off000109f2.bin
95a6d3436725ecc369f1edb1ea801b415ff196f656f039406819788856e9883d
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 17416 bytes