Malicious PDF — malware analysis report

Static analysis result for SHA-256 3680a6c92148e8f1…

MALICIOUS

PDF

81.9 KB Created: 2021-06-30 21:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b469b3252fbe7dd9b729a3b38aacca7 SHA-1: d6f686864a7776d0518e704f82721397d864ccb3 SHA-256: 3680a6c92148e8f1fedb9e9154d83dcadd785071ab30373b48ecaf1ead3da1b5
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous links to compromised websites and IP addresses, suggesting it is used to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a link farm designed to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9469b00bc42d91634fb16957d762067/38354385010.pdf
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/94616496156.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/pexefupogudab.pdf
    • http://mid-europe-ex.com/images/blog//file/87669914249.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160819506b693e---90546332743.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/0fa5faba0d4bafd5b3ac411f64f6409f/famegilu.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a071ea0a---wezusapajebivadinafux.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/1jagfs0aot72l59i9df0qmtu2e/baboxolaxikamo.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da6fb6f47---23693192171.pdf
    • http://anthonyvienna.com/sites/default/files/file/49150804362.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/a685652950b077ce731ee60fe6cb35ae/20962240005.pdf
    • https://dienlanhhonganh.com/images/pic/file/rugonetivamiduwi.pdf
    • http://feynburg-uhren.de/uploads/9584281999.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/32883345082.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/137b7c38c772b7c501c68ad3caebff42/68246901724.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534efafb78---newixijinejoxaw.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc2c1ade1---42695039581.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/9634755917.pdf
    • https://abe-rdc.com/userfiles/file/getemexamofefaki.pdf
    • http://aelma.com/sites/default/userfiles/file/2448091610.pdf
    • http://savvyais.com/userfiles/file/65257903058.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c0ae1e72---95832853564.pdf
    • https://semangkabiji.com/contents//files/59112527161.pdf
    • http://a9188.com/upload_files/art_files/files/20210618_103751.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=setup+wizard+keeps+stopping
    • 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_off0000d866.bin
72f738bbedd48828cea4ecd6a0a7a17cbd45bd00018ecd44f81801b2b0054c9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 18288 bytes
font_01_sfnt_off000107a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 16792 bytes
font_02_sfnt_off00011fbd.bin
8d847c90911630c0d183f7f9deb678c26fbb671f1690e9a1c63f58f3e7b27ee0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 10936 bytes