Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d663ef40d26efce…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 04:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce5b686e250c0b4b4442d98241fc9f1d SHA-1: 7a8a42e9658c1ac069ff32f4de0cdd13626fbd51 SHA-256: 8d663ef40d26efce22ee3a3b3fbb4bb1eae945a20c9e9a052a022a445d9dd69b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. This suggests the document is designed to lure users into clicking these links, potentially leading to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://harrisonfamilyreunion.org/clients/868801/File/zojufokirifafolujutokil.pdf In PDF document text
    • http://syuncyoku.jp/upload/file/dopadutobemosopilob.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/24753610595.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/47580339617.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jolu544ubagt4sm18sqtbpsb8g/13106572995.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/timolerupowumalejezito.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/wujixugapodasigikom.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/54603320513.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/64494569890.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7jd3prlkovlql5k9hckdheqbi8/bugazixunanezi.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105172111513614.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/popekiwitozedage.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/jufolewigosasereni.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/daxelenazab.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798d7ee1d5e---57069896646.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6e4cce2a---65771077330.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a83e8f2b45---54844372581.pdfIn PDF document text
    • https://mfdesign.hu/files/file/96475707031.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fe6d5f86ddfb751bb44d3d74bffec0aa/majapoxamixifumibubolom.pdfIn PDF document text
    • http://safarang.com/basefile/files/pijuzupo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16104be9095197---40614995103.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/25373206406.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/ximofagonagegos.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4brfpbqju6b4cjfhm919boj4dn/wimaxakipaxutoxazepowezu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/hs17og815hvp3rnnsffnpn4v1g/69628483217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=body+weight+quad+workoutPDF 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_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 17488 bytes
SHA-256: 94b50bc6909b24bebaeef6da962d3f1e21febc6f9c347aa1520feb38c0eb09ef
font_01_sfnt_off0001168b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 10800 bytes
SHA-256: 0c40406f8203e5e0a4b84d11175096d7813aa36c77ccb134792f917f91d61626
font_02_sfnt_off00012f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1