Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc3d751188fe76f…

MALICIOUS

PDF

87.6 KB Created: 2021-07-06 11:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27cc629a957b84629aae364c77ce21fa SHA-1: e0d6e088d9d938a863ff13048d5e5afb1049ca76 SHA-256: 0cc3d751188fe76f451dc1f187871994264c481397a16aceb52ab0276019b75c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malicious content. The presence of multiple external URIs and link farms suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ketchas.ru/uplcv?utm_term=misrepresentation+in+real+estate+listings
    • https://schmitz.cz/res/file/90076134402.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/da9d327d72af2ae325f4f452be18546c/39051160248.pdf
    • http://unseenadventure.com/userfiles/file/97573741800.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce385970b6---83528243796.pdf
    • http://studio-rivetti.it/userfiles/files/dawamawiri.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8eece3405---37768312673.pdf
    • http://applexin.com/ttpsea/files/file/4281540333.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b524ebaa74---gunegakulu.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/62910b4043e6c5dea3b6e99ce3a8efc1/34716767064.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9d1b0d8b---zikemedovow.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdc84d23c---lazibarivepewofebimove.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/46243000717.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c15b99028b4---lugilitofafij.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/filuja.pdf
    • http://constantemail.com/userfiles/file/1623767452fazepom.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5034b55767---wezezunevugitumezav.pdf
    • http://www.awakohchang.com/image/upload/File/ijamivilikavemewunopelu.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d8ffcf909---wokedukeguwazoseve.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a9fadcba82b4ca0c68c1080a74b31f55/lawozunopimuluku.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1f086eff4b570e83c5b1e57f222b83a8/zixomi.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f6a591d99---lekobagivedu.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/domd82cfqak0b1m9cul7rh7d14/gafenam.pdf
    • 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_off0000f4c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 16792 bytes
font_01_sfnt_off00010cd8.bin
904cb55edda7fc5db2522b4250b7f30f5def9731c4b4997e55511e7c31907164
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 17092 bytes
font_02_sfnt_off00013937.bin
02afbfa5623e592d7cac50339746701a6a968855fefa47bcf426a845de408bcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13937 10420 bytes