Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ea3cf4d873fa2b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 00:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7722b5b2128a3cdff377db443f37b8e SHA-1: 25ae55e199710968a16bf8c3b8d3f3e1cfbcdcb8 SHA-256: b7ea3cf4d873fa2b41857445f843e69f0254e55f0db39a4da09954699a3d1fdb
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users. While no scripts were extracted, the presence of numerous links to potentially malicious or compromised sites indicates a high likelihood of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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 http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0d924cf693191dfcc67b477669ebf1bf/36068931531.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c07abdac---judipupibewivaxamif.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/jerixefesolilifu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48d8c8916f---mepamedabofaxiz.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c41efe9ca5a76a4be40584e1e774c51b/87342780310.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8b21f6cdfa6eae62e9ffe407f52635fd/64863853862.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f7835319---geliresisuba.pdfIn PDF document text
    • https://phr4u.com/files/57161581447.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d35eaa61a3---xenowoxoreza.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/36533901472.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/durekaxefilugilo.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/76125873001.pdfIn PDF document text
    • http://atek-ent.com/upload/file/40222492970.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4d6d283d00e900934080efca3e3955eb/niwemajirera.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/64410575160.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/gaxopodasuzodaraliwuvug.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/dobajafali.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/zizikejagib.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210710_030537.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/sugesotimibubaxesaginixo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/adb16556a7615f54d7429c196913cd8e/liwukisamomefagurukutipor.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/33266658632.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/lumaroketadip.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/26117153777.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3354d888c---15882590683.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e66f24b405c220fcafa406f60727708f/45906253524.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d11cd4d9---37603383055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+speed+upPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000beea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEA 14612 bytes
SHA-256: 4429efe720e4706c69b7c96e9928823b3dc526814bbbdc7848111671a3f17636
font_01_sfnt_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 10212 bytes
SHA-256: 7113383e709856732147244139b760690e65fed453bee2f711edcbae8f976e58

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